A Letter From ANC

Welcome. Before we get into pacing windows and threshold work, I want to tell you what this playbook is — and what it isn't.

This isn't a training plan. We do training plans inside ANC, custom to you, your life, your race, and your physiology. This is something different. This is the language of racing the half-marathon — the physiology you need to understand, the frameworks that turn data into decisions, and the mindset that holds it all together when your legs start talking back.

Here's the truth about the half: it's the sharpest distance in distance running. Long enough that fitness matters. Short enough that mistakes punish you immediately. There is nowhere to hide in 13.1 — not in the way you can hide for a few miles inside a marathon. A marathon forgives a slightly hot first half if your aerobic engine is deep. A half doesn't forgive that. Go out two seconds per mile too fast and you'll bleed it back in the last 5K with interest. Skip a fueling window and the back half turns hostile. Misjudge the wind and your race plan unravels by mile 7.

That sharpness is exactly what makes the half such a rewarding distance to race well. When you nail a half — when the pacing, the fueling, the mindset, and the fitness all line up — you finish knowing exactly what you did. There's very little luck in a well-executed half. It's a precise expression of what you trained, expressed across about 90 minutes to two hours of work near threshold.

I've coached athletes through every kind of half-marathon outcome — first-timers crossing the line with tears in their eyes, age-group runners chasing a sub-1:30, marathoners using halves as race-pace rehearsals, triathletes building aerobic ceiling. The pattern across all of them is the same: great halves are built on disciplined patience in the first 5K, locked-in execution in the middle 5 miles, and brave commitment in the final 5K. Almost every athlete who races a great half does it in that order. Almost every athlete who doesn't, breaks one of those three.

This playbook gives you the physiology to understand why those three phases matter, the frameworks to execute each one, and the mental tools to stay with the plan when adrenaline and fatigue try to pull you off it.

"Inside out first. Build the engine. Trust what you've built. Then — and only then — let's see what you've got."

Read this whole document before race week. Read the race-day sections again the week of. And on race morning, read nothing — you'll already know.

Let's get to work.

— Coach Angela

The ANC Way

Every coaching philosophy is built on a handful of non-negotiables. Mine come from two decades of racing and coaching, and they show up in every plan we write, every workout we prescribe, and every race-day decision we make. Four pillars hold up the half.

1. Aerobic First, Always

The half-marathon sits closer to threshold than the marathon does — but it's still an aerobic event. The energy that gets you across 13.1 miles is overwhelmingly aerobic, even at threshold pace. That means the biggest, most durable gains in half-marathon performance don't come from chasing intervals. They come from a deep, well-developed aerobic system — the engine that lets you run 13 miles at threshold without falling apart.

What this looks like in practice: 75–85% of your weekly training hours are easy. Conversational. Nasal-breathing-possible easy. If that feels too slow, that's because your nervous system is used to a sympathetic, "always-on" state — and that's exactly what we're training out of you. Easy training builds mitochondrial density, capillarization, fat oxidation, cardiac stroke volume, and the orthostatic robustness your body needs to repeat hard sessions week after week.

The half rewards aerobic depth more than any other middle-distance race. The athlete who races a 1:35 half off mostly aerobic work will beat the athlete who races the same 1:35 off interval-heavy training — every time over a season, because the aerobic athlete can keep training while the interval athlete keeps breaking down.

2. Inside Out First

Workouts sit on top of a foundation. The foundation is sleep, fueling, stress regulation, and life stability. If the foundation is cracked, the workouts don't stick — they break you down without building you up. We always address the inside (recovery, food, sleep, nervous system) before we add more from the outside (volume, intensity, races).

This is the principle that decides whether you'll be racing strong in five years or recovering from another overtraining cycle. The athletes who win the long game treat recovery as training, not as the absence of training. In a half-marathon build — which can be as short as 10 weeks or as long as 16 — the margin between a sharp athlete and an overcooked athlete is razor thin. Recovery decides which one you are on race day.

3. Repeatable Before Harder

A workout you can repeat next week beats a hero session that breaks you. We design training as a sequence of repeatable doses, not isolated heroic days. If a session leaves you trashed for three days, the math doesn't work — you lost more than you gained.

In half-marathon training, this matters most for threshold work. The athlete who runs one massive threshold session and limps through the next four days gets less out of training than the athlete who runs a smaller, repeatable threshold session and stacks them across 10 weeks. Threshold fitness compounds across consistency, not heroics.

4. Trust What You've Built

Race day is an expression of training, not an audition for it. You don't earn fitness on race morning. You earned it in the weeks prior. The job on race day is to spend what you've banked — wisely, patiently, with discipline — not to chase a level of fitness you haven't deposited.

This shows up most painfully in the first 3 miles of the half, when fresh legs and adrenaline whisper that you're stronger than you are. Trust the plan. Trust the numbers. Trust the work.

The Half-Marathon Trap

Most half-marathons aren't lost in training. They're lost in the first 3 miles.

Here's what happens. You've tapered. You're sharp. You slept well (eventually). You had your coffee, your pre-race breakfast, your warm-up. The gun goes off. Your watch beeps at the first mile and the number is well below your goal pace. Your legs feel almost too good. The runner who was supposed to be your pacer is just up the road. You think: "I have so much in the tank. I'll bump it up just a little."

That decision — that one small "just a little" — is the single most expensive decision in half-marathon racing. It's the reason fit, well-trained, smart athletes have miserable second halves. It's the reason "I felt amazing through 10K and then crashed at mile 9" is the most common race report you'll read.

Why It Happens (The Physiology)

When you taper, your body is restored. Glycogen is full, fluids are topped up, muscles are repaired, nervous system is fresh. Adrenaline at the start raises your pain tolerance and dampens your perception of effort. So a pace that's actually above your sustainable race target feels like sustainable. RPE lies to you for the first 15–20 minutes. By the time RPE catches up — usually somewhere around mile 5 — the damage is done. You've overdrawn from your finite anaerobic reserves (D′), pushed your core temperature higher than it needed to go, and recruited muscle fibers that should have stayed in reserve for the final 5K.

The metabolic cost of that "just a little" extra pace isn't linear. Running 10 seconds per mile faster than your sustainable race effort in the first 5K doesn't cost you 10 seconds per mile later. It costs you 30–60 seconds per mile in the final 5K. The math is not in your favor.

What Smart Athletes Do Instead

The athletes who race great halves treat the first 5K like an extended warm-up that happens to be on race pace. They settle. They breathe. They let HR climb gradually. They watch other runners blow past in the first mile and they smile, because they know they'll see most of them again later — usually walking aid stations after mile 9.

The race is decided in the final 5K. That requires you to arrive at mile 10 with something left. That requires discipline in the first 5K — discipline that feels, in the moment, like underperforming. It isn't. It's racing.

"If your first mile feels exactly right, you're already overcooked. The right first mile feels too easy."

The Three Most Expensive Errors

1. Going out too fast in mile 1. The single most costly mistake. Discussed above. The fix is mental, not physical: decide before the race that the first mile will feel almost too easy, and enforce that decision regardless of what your watch says.
2. Skipping early fuel. "It's only 13.1 miles — I don't need to fuel" is one of the most common misconceptions in half-marathon racing. Anything over 80 minutes benefits meaningfully from in-race carbs. The athlete who takes a gel at mile 4 has fuel arriving at the muscles by mile 7 — exactly when it's needed.
3. Misreading HR drift in the back half. HR will climb in miles 8–13 even if pace is steady. Athletes who don't understand cardiac drift slow down in response to a rising number — leaving real time on the course. The right response is to triangulate (pace, HR, RPE) and only slow if RPE is also climbing fast.

Avoid these three and you've already out-raced 50% of the field — not because you're faster, but because you're smarter.

Your Engine — Five Landmarks

You don't need an exercise physiology degree to race the half well. But you do need to understand five landmarks — five points on your physiological map — because they shape every decision we make in training and on race day. I'll explain each one in plain language, and then I'll tell you why it matters to you over 13.1 miles.

1. LT1 — The First Lactate Threshold

LT1 is the upper edge of what we call "truly easy." Below LT1, your body is producing lactate at a very low rate and clearing it just as fast — net lactate barely rises. You can hold this all day, fueled mostly by fat, with minimal metabolic stress. For most trained runners, LT1 sits around 85% of Critical Speed.

Why it matters for the half: Most of your easy training should happen at or below LT1. This is where the aerobic adaptations live — mitochondrial density, capillarization, fat oxidation, cardiac stroke volume. The half is raced well above LT1, but it's earned below it. Athletes who train consistently below LT1 push LT1 itself upward, which means race pace becomes metabolically cheaper.

2. The Aerobic Crossover

As intensity rises, your body shifts its fuel mix from predominantly fat toward predominantly carbohydrate. The aerobic crossover is the zone where that shift happens.

Why it matters for the half: Your half-marathon race pace lives in and just above this zone. That's why fueling matters — you can't hold 13 miles at race pace on fat alone, even though you have plenty in storage. You have to feed the system carbs. Get fueling right and you can hold the top of your sustainable range. Get it wrong and you'll be forced to drop pace as your body downshifts to protect itself.

3. CS — Critical Speed

CS represents the highest steady-state effort you can sustain for roughly 30–50 minutes before your physiology starts to fall apart. Think of CS as the boundary between "hard but sustainable" and "this will end soon." Above this line, lactate accumulates faster than you can clear it, oxygen demand outpaces supply, and the clock starts ticking.

Why it matters for the half: CS anchors all your training zones. Every percentage you'll see in this playbook — race pace, threshold work, easy aerobic — is expressed as a percentage of CS. Half-marathon race pace sits at 90–95% of CS — close enough to feel the heat, far enough to hold for 13.1. Getting an accurate CS is the foundation of everything else. (See Chapter 7.)

4. sVO₂max — Speed at Maximal Oxygen Uptake

sVO₂max is the speed at which you're using oxygen as fast as your body can deliver it. You can hold this for roughly 4–8 minutes before exhaustion. Far above half-marathon pace.

Why it matters for the half: We touch sVO₂max sparingly in training — short intervals to lift the ceiling — but you'll never run anywhere near it on race day. The reason we train it occasionally is that lifting the ceiling makes everything below it cheaper, including the threshold pace you'll race at.

5. D′ — Your Finite Anaerobic Battery

D′ is the finite "battery" you carry above CS. Think of it as a fixed-size jar of matches. Every time you run above CS — a hill, a surge, a pass, an emotional moment — you burn a match. Once the jar is empty, you cannot work above CS anymore, no matter how much you want to. The jar refills slowly when you drop back below CS, but never fully refills mid-race.

Why it matters for the half: In a half, you want to arrive at mile 12 with D′ almost empty — but not before. Spending D′ in mile 2 because the pace felt easy buys you a brutal mile 11. Smart half-marathon racing protects D′ until the final 5K, then spends it deliberately in the last mile and finish kick. That's why pacing matters so much in this distance: the matches are finite, and spending them early is a debt the back half cannot pay.

"The half is the art of running close to the line for 13 miles — then deciding what's left for the last one."

Pacing Instruments — HR, CS, Power, RPE

You have four ways to measure effort on race day. Each one tells a different part of the story. Each one has strengths and blind spots. No single instrument should fly solo — the magic is in how you combine them, and in the half-marathon, the right instrument to listen to changes as the race unfolds.

Heart Rate

HR is a measure of internal load — what the effort is costing your cardiovascular system. It integrates everything: heat, hydration, sleep, stress, caffeine, fatigue, fueling state. That makes it incredibly informative — and incredibly noisy.

Pros: Reflects internal cost. Catches heat stress and dehydration before pace does. A great long-game indicator of whether you're managing the day. Honest about under-recovery before you are.

Cons: Lags 60–90 seconds behind effort — making it nearly useless in the first mile of a race when HR is still catching up. Drifts upward over the back half (cardiac drift). Can be artificially elevated by adrenaline, caffeine, or poor sleep. Chest straps are reliable; optical wrist sensors are often not.

Best use in the half: A ceiling in miles 1–4 when adrenaline can fool you. A reality check in miles 5–8. Less reliable in the final 5K — drift takes over.

Critical Speed (Pace)

CS, expressed as min/mile or min/km, is your direct objective pacing measure on the run. Anchored to your most recent testing.

Pros: Direct, immediate, terrain-aware (with GPS). Doesn't lag. Doesn't drift with heat. Lines up directly with goal time.

Cons: GPS noise can be significant — especially in tunnels, under trees, or in crowded courses. Doesn't reflect the cost of holding that pace on a hot day or a hilly course. A flat 7:00/mi at mile 1 is not the same effort as a 7:00/mi at mile 11.

Best use in the half: Your primary dial in miles 4–10. The number you committed to. On race day, pace serves effort — not the other way around.

Running Power

For athletes using a running power meter, power estimates mechanical work output. Honest in places where pace isn't.

Pros: Truthful on hills (a watt is a watt, uphill or down). Responds immediately. Immune to GPS noise. Pairs cleanly with CP zones.

Cons: Algorithm-dependent — different devices give different numbers. Requires a real CP, not a guess. Less universally adopted than pace and HR.

Best use in the half: Hilly or windy courses. The metric that doesn't get fooled by terrain. A useful safety net when pace lies.

RPE — Rate of Perceived Exertion

RPE is your subjective sense of effort on a 1–10 scale. The oldest and most universal pacing tool — and, when calibrated through training, one of the most powerful.

Pros: Always available. Free. Integrates everything you're feeling — physiological, mental, emotional. The only instrument that adjusts in real time to how the day is unfolding.

Cons: Unreliable in the first 15–20 minutes when adrenaline is high. Has to be calibrated by training — untrained RPE systematically under-rates effort early and over-rates it late.

Best use in the half: The boss in the final 5K. When HR, pace, and power disagree, trained RPE breaks the tie. In the last mile, RPE is essentially the only instrument that matters.

How To Triangulate

The single most important pacing concept in this playbook: pace/power tells you what you're doing. HR tells you what it costs. RPE is the tiebreaker.

When two instruments agree and one disagrees, trust the two. Examples:

• Pace on target, HR rising, RPE rising: the day is getting expensive. Hold pace but address the cost — drink, cool, sodium, fuel.
• Pace on target, HR on target, RPE high: probably mental, probably temporary. Breathe, reset, keep going. Don't change pace yet.
• Pace on target, HR low, RPE low: day is unfolding well. Stay disciplined — don't chase. The number is the number for a reason.
• Pace below target, HR on target, RPE high: something is wrong. Heat, fueling, fatigue, course. Address the cause; don't force the pace.

Your Zones

Zones are how we convert physiology into action. Here is the ANC zone table for running, anchored to Critical Speed. These percentages assume your CS is recent and accurate — if it's outdated or guessed, the zones will lie to you.

Run Zones — % of Critical Speed

Key markers: LT1 ≈ 85% CS. LT2 ≈ 105% CS (Critical Speed itself).

Half-Marathon Race Window

The half is raced at 90–95% of Critical Speed — the top of Z2 into the bottom of Z3. HR climbs through roughly 85–95% of Threshold HR across the race. That's the window. Where you sit inside it depends on your goal, the course, the day, and your training history. That's a conversation with your coach.

Why the half lives there: below 90% of CS and you're racing too conservatively — leaving real time on the course. Above 95% and you'll touch threshold too early and unravel in the last 5K. The half rewards precision in a way no other distance does.

Race-Day Pacing Bands

If your zones don't feel right — if the prescribed paces feel impossible, or way too easy — that's a signal that your CS is outdated. Re-test. Don't race off old numbers.

Testing That Tells The Truth

Zones built from a guess will lie to you on race day. Zones built from an outdated test will lie to you on race day. The single most valuable thing you can do for your pacing — especially in a half, where small errors compound quickly — is to test honestly, test recently, and retest periodically.

Why We Use Critical Speed Testing

Traditional threshold testing relies on a single 20-minute or 30-minute all-out effort, then estimates threshold by subtracting a percentage. That works — barely — but it's noisy, demanding to execute well, and gives you a single data point. Critical Speed testing uses multiple shorter efforts at different durations, which mathematically separates your aerobic ceiling (CS) from your anaerobic capacity (D′). You get two numbers instead of one, both of which matter for race pacing.

The Run Protocol — Time-Based or Distance-Based

Three all-out efforts with full recovery between, done across one session or two:

From these three we calculate CS, D′, your Threshold HR (from the most stable portion of the 12-minute effort), and which engine you currently lean on. We re-test every 5–8 weeks to keep zones honest as fitness changes.

How To Execute A Test

1. Warm up properly. 15–20 minutes building from easy to a few short pickups. Don't go in cold.
2. Pace the first half conservatively. The biggest mistake in maximal testing is going out too hard. Start at what feels controlled-but-firm; push the final third.
3. Go to the well. The last 60 seconds should feel like you're racing for your life. If you finished comfortably, the data is suspect.
4. Recover fully between efforts. Easy jog for at least 8–10 minutes between each test.
5. Repeat every 5–8 weeks through a half-marathon build. Fitness changes. So should your zones.

No Power Meter or GPS?

The same protocol gives you HR zones directly. HR + RPE alone is enough to race a great half-marathon — and many of our athletes do exactly that.

The Sustainable Aerobic Range

Your sustainable aerobic range is the band of effort where you can hold steady output without accumulating excess fatigue — the "all-day" zone of distance running. It's the most important physiological territory in middle- and long-distance racing, and it's where half-marathon goal pace lives.

What It Is, Physiologically

Below this range, you're working so easily that you're not stressing the aerobic system enough to drive adaptation. Above it, you're producing lactate faster than you can clear it — fatigue accumulates, fuel burns faster, and the clock is ticking. The sustainable aerobic range sits between these two boundaries: roughly from LT1 at the bottom up to just below CS at the top.

For the half, your race lives at the upper edge of this band — meaningfully higher than where you'd race a marathon or full-distance triathlon. That's the difference. The half is the sharpest sustainable race in distance running.

The Four Tiers Of Athlete Readiness

Where you race within the sustainable aerobic range depends on your training age, durability, and recovery history. We sort athletes into four practical tiers:

"The half doesn't reward your best workout. It rewards your most repeatable threshold."

State Management & The Daily Check-In

Training stress is half the equation. Your state — what your body and life bring to the session — is the other half. The athletes who race great halves are the ones who manage state across the whole build, not just on the day of a key workout. Four pillars guide how we do it.

The Daily Check-In

Before every key session, run a traffic-light scan across: sleep duration and quality, resting HR vs baseline, HRV, mood, life stress, soreness, GI status, hydration. Count the flags. The count tells you what to do.

This 30-second check is what protects you from the burnout, illness, and overuse injuries that derail most half-marathon builds in weeks 6–10. It costs nothing. It saves seasons. The athletes who go red and push through are the ones we see in the injury chair six weeks later.

The Workout Toolkit

This isn't a training plan. It's the vocabulary of training — the categories of work we use to build a half-marathoner. Understand what each session is for, and you'll understand the logic behind any plan we write you.

Easy Aerobic Running

The bulk of weekly volume. RPE 3–4, conversational, Zone 1 (75–85% CS). Builds capillaries, mitochondria, fat oxidation, and the ability to repeat tomorrow what you did today. Trap to avoid: turning easy days into "moderate" days. Moderate is the enemy of both real easy and real hard. If you can't carry on a conversation, you're going too fast.

Zone 2 Sustained Running

The engine room of half-marathon fitness. Continuous, controlled, RPE 5–6, sitting in upper Z1 to mid-Z2 (85–92% CS). Long enough to teach the body to produce sustained power efficiently — typical sessions: 30–60 minutes of continuous Z2. At ANC we don't call this "tempo." It's Zone 2 — the term tells you what it is. This is where the aerobic ceiling for racing gets built.

Threshold (Z3) Work

Continuous or interval work right around your Critical Speed (95–105% CS) — the most race-specific work a half-marathoner does. Typical sessions: 4×8 min, 3×10 min, 2×15 min, or 1×20–30 min at threshold pace, with short recoveries. Lifts the threshold ceiling itself. The defining session type of half-marathon training, used in measured doses inside a structured build.

Half-Marathon Pace Work

Race-pace segments built into longer runs or as standalone sessions. Examples: 3×3 miles at half-marathon goal pace, or a 12-mile run with the middle 6 miles at goal pace. Teaches you what goal pace feels like at minute 60, not minute 6. This is where pacing instruments get calibrated for race day, and where you discover whether your goal is realistic with weeks still to adjust.

Short Uphill Power Efforts

Brief, repeated efforts on a moderate incline — 8–12 reps of 30–60 seconds, with walk-down recovery. Builds running-specific strength, stride mechanics, and neuromuscular recruitment without the joint cost of fast flat work. Underused by most half-marathoners and a meaningful source of free speed.

Short Fast Neuromuscular Pickups (Strides)

Very short, very fast efforts — 4–8 reps of 20–30 seconds at near-top-end pace, with 60–90 seconds easy recovery. Done at the end of an easy run or after a warm-up. Keep top-end alive even in high-volume weeks; improve running economy at every slower pace. Low cost, high reward. Should be in your week year-round.

The Long Run

Even for the half, the long run matters — it builds durability and tendon resilience, and turns half-marathon pace into a smaller fraction of what you can do. Most half-marathoners peak their long run at 90–120 minutes. The half-specific long run often includes a finishing block at progressive effort — last 20–30 minutes building toward race pace — to teach the body to push when tired.

VO₂max Touch Work

Short hard intervals above CS — typical sessions: 5×3 min or 6×800 m at VO₂max effort, with full recoveries. Used sparingly in the build — once every 2–3 weeks. Raises sVO₂max and makes everything below it cheaper, including race pace. Most half-marathoners need less of this than they think.

Pacing Workouts

The most underrated category. Sessions designed not to build fitness but to teach pacing — finishing every interval at the same time, holding negative splits, executing fueling without thinking. Pacing is a skill. We train it deliberately.

Pacing The Half-Marathon

Pacing decides the half-marathon. The athletes who execute a smart pacing strategy beat fitter athletes every weekend. The half punishes pacing mistakes faster than any other distance — you can blow a half-marathon in mile 3 and never recover.

The Core Principle: Even Or Negative Splits

The fastest halves at every level are run with even splits or a slight negative split (the second half faster than the first). The cost of running too hot early is non-linear — running two seconds per mile too fast in the first 5K doesn't cost you two seconds per mile later. It costs you 20–30 seconds per mile in the final 5K. The math is brutal and consistent.

Look at any well-run half — recreational age-grouper or elite. The splits are within a few seconds across the first three 5Ks, and the final 5K is the fastest. That's not luck. That's the result of restraint in the first half being converted to commitment in the second half.

The Half-Marathon Window

Goal pace lives at 90–95% of Critical Speed, with HR climbing through 85–95% of Threshold HR across the race. The exact slot inside that window depends on:

• Your sustainable aerobic range (Chapter 8).
• Course profile (hills add cost even when pace stays flat).
• Weather (heat compresses the window — sometimes by 10–15 seconds per mile).
• Training age and previous halves.
• How recently you completed a hard build vs. a recovery week.

Pacing By Segment Across The Race

Why Pace Alone Will Hurt You

A pace-only strategy assumes the day cooperates. It assumes flat course, no wind, perfect temperature, predictable HR. None of those assumptions survive 13.1 reliably. The athletes who PR consistently arrive at the start with a range, not a number — and a hierarchy for which instrument leads in which segment.

If the day is hotter than expected, your pace target softens by 8–15 seconds per mile but your effort target stays the same. If you ignore the heat and chase the original number, you'll touch threshold in mile 4 and crash in mile 10. Pace serves effort. Not the other way around.

HR Drift After Mile 8

HR will climb in the second half even when effort is unchanged. Cardiac drift is normal — a response to dehydration, glycogen use, and core temperature rise. Do not slow down purely because HR is higher than plan after mile 8. Cross-check with RPE and pace. If RPE is where it should be and pace is on goal, the drift is the cost of doing business. (See Chapter 20 for more.)

Course Adjustments

Hilly courses require pace flexibility — hold effort, accept that uphill pace will be slower and downhill pace will be faster. Don't fight the hill; let it pass. Net-uphill or net-downhill courses change your goal time but not your effort target. Power-based pacing helps enormously here. Out-and-back courses with wind: race the headwind on effort, not pace; let the tailwind give you free speed.

"Pace your race. Don't let your race pace you."

12 · Fueling & Hydration

The half‑marathon sits in a unique fueling window. It's long enough that carbohydrate intake matters, but short enough that many athletes skip it and pay the price in the final 5K. The athletes who fuel early and consistently are the ones who hold pace when others fade.

Why Fueling Matters at This Distance

At half‑marathon race pace (90‑95% CS), you are burning a high proportion of carbohydrate. Liver glycogen alone cannot sustain 13.1 miles at race intensity without exogenous carbohydrate support. The athletes who bonk in miles 10‑13 are often not undertrained — they are underfueled.

Your brain also runs on glucose. As blood sugar drops in the final third, your perception of effort climbs, your pacing decisions degrade, and your willingness to push fades. Fueling protects both your legs and your decision‑making.

Pre‑Race Nutrition

3 days out: Increase carbohydrate intake to 7‑10 g/kg body weight per day. This is not "carb loading" in the old sense of pasta dinners — it's a steady, distributed increase. Hydrate consistently. Reduce fiber 24‑48 hours out to minimize GI risk.

Race morning: 2‑3 hours before the gun: 1‑2 g/kg of easily digested carbohydrate (oatmeal, toast with honey, banana, bagel). 500‑750 ml fluid with electrolytes. 30‑45 minutes before: optional 20‑30 g carbs (gel, sports drink, applesauce pouch) plus a small sip of water. Caffeine, if used: 1‑3 mg/kg, 45‑60 min before start.

In‑Race Fueling Targets

For a sub‑90 minute half, one gel at 30 minutes and one at 60 minutes is often sufficient. For a 2+ hour half, plan a gel every 30‑35 minutes plus sports drink at aid stations.

The Four Iron Rules of Fueling

1. Start early. Take your first gel at 25‑30 minutes, before you feel like you need it. Once you feel low, you are already behind.
2. Pair carbs with fluid. Gels without water sit in the gut and cause distress. Always chase a gel with 100‑150 ml of water.
3. Train your gut. Practice your race‑day fueling in long runs and Zone 2 sessions. Never try a new product on race day.
4. Don't chase calories late. If you've fueled well early, the final 5K is about execution, not consumption. Trying to gulp gels at mile 11 often causes more harm than good.

Heat & Hydration Adjustments

For every 10°F above 60°F, increase fluid intake by 10‑15% and sodium by 25%. In hot conditions (>75°F), consider a pre‑race sodium load (500‑1000 mg sodium 60‑90 min before start) and carry a flask if course aid is sparse.

Use the Race Fuel Planner to dial in your personalized fueling targets. For deeper context on training the gut and pre‑race nutrition, see the ANC Knowledge Hub.

13 · Recovery & Sleep

Recovery is where adaptation lives. The work creates the stimulus; recovery creates the result. For a half‑marathon athlete, sleep is the single most powerful recovery lever you have — more than ice baths, more than massage, more than supplements.

Sleep as the Primary Lever

Target 7‑9 hours per night, with consistent sleep and wake times. The nights of Thursday and Friday before a Sunday race matter more than Saturday night (when pre‑race nerves often disrupt sleep). Bank sleep early in race week.

Signs of inadequate recovery include elevated resting HR (>5 bpm above baseline), depressed HRV, persistent soreness, mood disturbance, GI changes, and reduced libido. If two or more flags appear, treat the day as yellow or red on the traffic‑light system.

Post‑Workout Nutrition

Within 30‑60 minutes of a hard session: 1 g/kg carbohydrate plus 20‑30 g protein. This is not a magic window, but it accelerates glycogen replenishment and protein synthesis, especially when sessions are back‑to‑back.

Recovery Modalities

The hierarchy is: sleep, then nutrition, then stress management, then everything else. Massage, foam rolling, compression, sauna, and contrast showers can all help, but they are accents — not substitutes for the basics. Active recovery (20‑30 min easy walk or spin) often does more than passive rest.

For more on heat exposure and adaptation, see Heat Acclimation: What the Research Actually Shows.

14 · Race Week

Race week is not training week. It is preparation week. Your job is to protect the fitness you have built, sharpen your readiness, and arrive at the start line calm, fueled, and clear.

Volume & Intensity

Volume drops 30‑50% from your peak weeks. Intensity is preserved through short, sharp efforts — strides, race‑pace pickups of 2‑4 minutes — to keep the system primed without creating fatigue. Long runs are shortened. No new workouts. No "just one more" sessions.

Course Knowledge Checklist

Study the course map and elevation profile. Identify: start corral logistics, first‑mile congestion zones, hills (especially after mile 8), turn‑arounds, aid station locations, sun/shade patterns, the final mile, and the finish chute. Know where you will take each gel.

Aid Station Strategy

Plan to take fluid at every aid station, even if it's just a sip. Slow slightly through the table, grab cleanly, walk 5‑10 steps if needed to drink without choking, then re‑engage pace. The 3‑5 seconds you "lose" at an aid station is repaid many times over in the final 5K.

Weather Contingency

Travel, Sleep, & Logistics

Arrive at least 1‑2 days before race day if traveling. Prioritize Thursday/Friday sleep. Lay out kit the night before — bib, shoes, socks, watch, gels, fuel belt or flasks, throwaway layer, anti‑chafe. Eat familiar foods. Hydrate steadily, not aggressively.

Shake‑Out & Mental Rehearsal

Day before: 15‑20 min easy jog with 3‑4 strides. Visualize the race in three phases — composed first 5K, locked‑in middle 5 miles, courageous final 5K. Rehearse your fueling plan mentally. Rehearse your "hard‑moment" response.

"Race week isn't training week. It's preparation week. Your job is to arrive — not to prove."

15 · Race Morning

Race morning is choreography. Every step is rehearsed. Every decision is pre‑made. You should feel like you're running a checklist, not making choices.

Timing

Wake 3 hours before the gun. Eat breakfast 2.5‑3 hours out. Arrive at the venue 60‑75 minutes before start. Bathroom, bib check, gear bag, warm‑up, corral — in that order.

Breakfast

1‑2 g/kg carbohydrate, low fiber, low fat, familiar. Examples: oatmeal with honey and banana, bagel with jam, white rice with a small amount of honey. 500 ml fluid with electrolytes.

Pre‑Start Top‑Off

20‑30 minutes before the gun: one gel (20‑30 g carbs) plus 100‑150 ml water. Caffeine, if used, 45‑60 min before.

Warm‑Up

10‑15 minutes: 5‑8 min easy jog, 4‑6 dynamic mobility movements, 3‑4 strides building to race effort. Get to the corral with 5‑10 minutes to spare. Stay loose, breathe slow, repeat your opening mantra.

16 · The First 5K — Composure

The first 5K is where races are lost, not won. The gun goes off, adrenaline spikes, and your perceived effort drops. Pace that feels "easy" in mile 1 is often 10‑20 seconds per mile too fast — and you will pay for it in mile 11.

Targets

• Heart rate: 83‑88% of Threshold HR
• Pace: 1‑3 seconds per mile slower than goal average
• RPE: 6 out of 10
• Breathing: nasal or controlled mouth, conversational rhythm

Execution Cues

Let runners pass you. Resist the urge to match the surges around you. Your race is not their race. Check your watch at the first mile marker — if you're under goal pace, ease back deliberately. Take your first gel at 25‑30 minutes regardless of feel.

Mantra: "Slow is smooth. Smooth is fast."

17 · The Middle 5 Miles — Lock In

Miles 4 through 8 are where the race is built. The early adrenaline is gone. The final push is still distant. This is where disciplined athletes settle into rhythm and let the work do its job.

Targets

• Critical Speed: 91‑93% CS
• Heart rate: 88‑92% of Threshold HR
• RPE: 7 out of 10
• Cadence: hold steady, 175‑185 spm typical

Execution Cues

Find a rhythm and hold it. If the course climbs, soften pace and hold effort — do not surge. If it descends, let gravity help but don't accelerate beyond goal effort. Fuel on schedule: second gel around 55‑65 minutes. Drink at every aid station.

Monitor HR drift. A modest rise (2‑5 bpm) at the same pace is normal. A sharp rise (>8 bpm in 2 miles) is a warning sign — soften slightly and check fueling/hydration.

Mantra: "Steady is strong. Effort over pace."

18 · The Final 5K — Courage

This is the race within the race. Everything before mile 10 was setup. Now you spend what you've protected. The athletes who finish strong are not the ones who feel best at mile 10 — they're the ones who decided long ago that mile 10 is where the work begins.

Targets

• RPE: 8 building to 10
• Pace: hold or accelerate
• HR: not reliable here — drift makes it lag the truth
• Cadence: lift slightly if pace fades

Execution Cues

Shorten your time horizon. Don't think "3 more miles." Think "this mile, this minute, this breath." Pick a runner ahead and reel them in. Then pick the next. Lift cadence before lifting effort — a faster turnover often unlocks pace without a feeling of straining.

This is where D' (your anaerobic battery) gets spent. You have protected it through 10 miles of discipline. Now is the moment to use it.

Mantra: "I trained for this part. This is mine."

19 · Heart‑Rate Drift

HR drift is the gradual rise in heart rate at the same pace as a race progresses. It is normal. It is expected. But understanding it prevents panic and bad decisions.

A sudden HR spike (>8 bpm in under 2 miles) without a corresponding effort change suggests dehydration, undercooling failure, or fueling shortfall. Soften pace slightly, take fluid and a gel, and reassess at the next mile.

20 · The Mental Game

The half‑marathon is won between the ears as much as between the lungs and legs. The mental work is not motivation — it is preparation. You decide how you'll respond to hard moments before the gun, not during them.

Pre‑Plan Your Hard Moments

Every half‑marathon contains predictable hard moments: the surge of early adrenaline, the lull around mile 6, the doubt at mile 9, the wall of mile 11. Name them in advance. Decide your response in advance.

The Cue → Response Loop

When effort climbs and the voice gets loud:

1. Notice — name what is happening ("this is mile 10, this is supposed to be hard").
2. Cue — return to a physical cue (cadence, breath, posture, relaxed jaw).
3. Mantra — repeat a pre‑chosen phrase ("steady is strong," "I trained for this").
4. Re‑engage — shorten the horizon to the next mile marker, the next aid station, the next breath.

Mantra Library

• "Slow is smooth. Smooth is fast." (Early)
• "Effort over pace." (Middle)
• "This is mine." (Final 5K)
• "Strong and smooth."
• "One mile at a time."

21 · Self‑Sabotage Pitfalls

Most blown races are not blown by lack of fitness. They are blown by small, predictable acts of self‑sabotage. Name them so you can avoid them.

• Going out too fast. The most common error. If mile 1 feels easy, you're probably going too fast.
• Skipping the first gel. "I feel fine" is not a reason to skip fuel. Fuel on schedule, not on feel.
• Skipping aid stations. Even small sips matter. The 3 seconds are repaid in the final 5K.
• Chasing surges. Other runners are not running your race. Let them go.
• Negotiating with the voice. The voice at mile 9 is not a council member. It does not get a vote.
• Looking at the watch too often. Trust the plan. Check at mile markers, not every 30 seconds.
• Trying something new on race day. New shoes, new gels, new caffeine dose — never on race day.

22 · If/Then Contingency Plan

Champions don't avoid problems. They plan responses. Here are the most common race‑day scenarios and the disciplined response to each.

23 · After The Finish

The finish line is not the end of the race. The next 48 hours determine how you recover, what you learn, and how you arrive at your next start line.

First 30 Minutes

Walk for 10‑15 minutes. Sip fluid with electrolytes. Eat something small with carbs and protein within 30‑60 minutes — a banana, a recovery drink, a piece of toast with nut butter.

First 24 Hours

Continue to hydrate. Eat regular meals with carbs and protein. Walk easily. Avoid alcohol if possible — it impairs recovery. Sleep is the highest priority.

Days 2‑7

Active recovery: easy walks, easy spins, mobility. No structured running for 3‑5 days. Listen to soreness. Most athletes can return to easy running by day 4‑5 and structured work by day 7‑10.

Race Review

Within 48 hours, write down: what went well, what surprised you, what you'd change, and one specific lesson for next time. This is how races become wisdom.

24 · Work With ANC

This playbook is a racing language. If you want a training plan that builds the fitness behind it — and a coach who helps you make the decisions inside it — there are several ways to work with us.

• ECHO 1:1 Comprehensive Coaching — Full personalized coaching for athletes who want the highest level of support.
• ANC Training Plans — Structured plans for runners and triathletes across distances.
• Critical Speed & Power Testing — Get your true zones with our testing service.
• Race Fuel Planner — Personalized fueling targets for race day.
• ANC Knowledge Hub — Free articles on physiology, pacing, fueling, and the science behind the methods.

25 · Glossary

LT1 (Lactate Threshold 1)

The first rise in lactate above resting baseline. Marks the top of the truly aerobic zone. Often near 75‑80% of Threshold HR.

LT2 (Lactate Threshold 2)

The point at which lactate accumulates faster than it can be cleared. Closely aligned with Critical Speed for trained runners.

Critical Speed (CS)

The highest pace you can sustain in a quasi‑steady state — typically 30‑45 minutes for trained athletes. The anchor of all running zones.

Critical Power (CP)

The cycling equivalent of Critical Speed.

sVO₂max (severe VO₂max)

The intensity at which VO₂max is reached — typically sustainable for 3‑8 minutes.

D' (D‑prime)

The finite work capacity you can do above Critical Speed. Your anaerobic battery. Once spent, recovery is slow.

W' (W‑prime)

The cycling equivalent of D'.

RPE (Rating of Perceived Exertion)

A 1‑10 self‑assessment of effort. Becomes the most reliable pacing instrument when HR and pace become unreliable.

Zone 2

Aerobic conversational effort. 75‑85% of Threshold HR. The foundation of endurance fitness.

Sustainable Aerobic Range (SAR)

The intensity band you can hold for the full race distance without metabolic blowup.

The Last 5K

Miles 10‑13.1. The race within the race. Where preparation, fueling, and mental discipline meet.

26 · A Final Word

The half‑marathon rewards the disciplined, not the brave. Bravery is for the final 5K — and only after discipline has earned you the right to spend it.

Trust what you've built. Race the race in front of you, not the one in your head. Fuel early. Pace by effort. Protect the final 5K. And when it gets hard — because it will get hard — return to your cues, your mantras, and your breath.

You don't have to feel ready. You have to be prepared. And if you've worked the work, you are prepared.

"Pace your race. Don't let your race pace you."
— Coach Angela