Performance Guides

How to Use These Guides

PaceWOD is not a generic fitness blog. Every article here is written for athletes who train with data — pace splits, heart rate zones, watch metrics, race results — and want to know when to trust the number and when to question it. We built the site around a simple problem: your Garmin, COROS, and Apple Watch give you more data than most training plans know how to interpret. Our guides close that gap.

What Makes PaceWOD Different

Most fitness content stops at "run easy" or "do intervals." We start where those instructions break down. Why does your easy run drift into zone 3 on a hot day? Why does Garmin predict a 3:45 marathon from a hilly 10K? Why does VO2 max on your watch drop after your best race week? Each guide names the formula, device behavior, or physiological mechanism behind the confusion — then gives you a decision rule.

Content falls into three layers that work together:

• Guides explain concepts — zone 2 physiology, VO2 max pacing, EMOM structure, race-day fueling
• Training plans apply those concepts across 8–16 weeks with explicit paces, HR ranges, and adjustment rules
• Tools produce the numbers the guides reference — zone boundaries, race predictions, calorie estimates, WOD templates

A guide without a tool gives theory without inputs. A tool without a guide gives numbers without context. Use both.

Recommended Workflow

Step 1 — Establish baselines. Before reading training plans, calculate your zones with the Zone 2 Calculator and HR Zones Calculator. Enter a recent race into the Race Predictor. These outputs become the paces and HR ceilings referenced throughout the plans.

Step 2 — Match guide to goal. Training for a half marathon? Read the Easy Run Pace Guide first — most plans fail because easy days are too hard, not because quality sessions are too easy. Chasing VO2 max? Read the wearable accuracy article before obsessing over weekly Garmin updates.

Step 3 — Validate with real sessions. Run one week as written. Compare watch HR against perceived effort. If tempo HR exceeds 88% max before the prescribed duration ends, the plan's pace targets need adjustment — not your commitment. Our guides explicitly say when to scale back.

Step 4 — Re-calibrate monthly. Race or time trial every 4–6 weeks. Update the calculators. Trends matter more than snapshots — a zone 2 pace that drops 8 sec/km over six weeks at the same HR is real progress, even if the watch VO2 max graph looks flat.

Who This Content Is For

Recreational to competitive runners who own a GPS watch and want structured training without hiring a coach. CrossFit athletes who also run and need conditioning work that does not destroy leg freshness before long runs. Data-curious athletes who ask "why does this number disagree with that number?" instead of averaging them and hoping for the best.

If you prefer motivational posts about "listening to your body" without defining what that means in bpm or sec/km, this library will feel overly technical. If you have ever argued with your watch about whether you were really in zone 2, you are in the right place.

Honest Limits

We cite established methods — Daniels, Friel, Riegel, MET tables, Firstbeat whitepapers — and show our math. We also state what those methods cannot do. A race predictor does not know your fueling strategy. A zone calculator does not know your cardiac drift on hills. An EMOM template does not know your shoulder mobility. Guides tell you what to do when the formula and reality diverge.

Topic Map and Reading Paths

The library above is organized by training domain, not by difficulty. Most articles cross-reference each other because real training problems rarely stay in one category — a weight-loss question involves zones, a zone question involves device accuracy, a VO2 max block requires easy-pace discipline. The map below shows how topics connect, followed by suggested reading orders for two common athlete profiles.

How Topics Connect

• Foundation layer: Easy Run Pace → Zone 2 Running Guide → Zone 2 vs Zone 3. Master easy intensity before reading fat-burn or VO2 max content — most downstream confusion starts with runs that are too hard.
• Energy and body composition: Watch Calorie Accuracy → Running Calories / CrossFit Calories → Deficit Size → Protein → Running vs CrossFit → Workout Selection.
• Sleep and recovery readiness: Sleep Basics → Tracker Limits → HRV Decisions → Sleep Debt → Pre-Race Sleep / Evening WODs.
• Performance ceiling: VO2 Max Guide → How to Improve VO2 Max → Garmin vs Lab VO2. Understand the metric before chasing it on your watch.
• Device literacy: Garmin vs COROS HR → Apple Watch vs Garmin → Garmin Training Status → RHR and Recovery.
• Race execution: Race Predictor Limits → distance-specific guides (5K, Half, Marathon) → Fueling.
• CrossFit crossover: Running + CrossFit Balance → Weekly Programming → formats (EMOM / AMRAP / For Time / Chipper) → Scaling → Benchmarks / Open Strategy.
• CrossFit skills & engine: Gymnastics → Barbell Cycling → Engine → Recovery.
• Training methodology: Base Building → 80/20 Polarized → Lactate Threshold → Intervals.
• Race preparation: Tapering → Race Week → Race Day Nutrition → distance pacing guides.
• Environment: Heat / Cold / Altitude — adjust effort before pace; trust HR over split targets.

Recommended Order: New Runners

If you are building a running habit from scratch or returning after time off, read in this sequence before picking a training plan:

1. Easy Run Pace Guide — set HR ceiling and talk-test baseline
2. Zone 2 Running Guide — understand why easy volume compounds
3. Zone 2 vs Zone 3 — learn to recognize gray-zone drift
4. Beginner 5K Plan or Beginner 10K Plan — apply concepts to a structured block
5. Calorie Burn — only if body composition is a parallel goal

New runners should defer VO2 max intervals and race-specific plans until eight or more weeks of consistent easy running. The Zone 2 Calculator and HR Zones Calculator are prerequisites, not optional extras.

Recommended Order: CrossFit Athletes Adding Running

CrossFit athletes typically arrive with high anaerobic capacity and underdeveloped aerobic base. The failure mode is running every session at metcon intensity. Read in this sequence:

1. Easy Run Pace Guide — recalibrate what "easy" means outside the box
2. Zone 2 vs Zone 3 — stop treating every run like a WOD
3. Garmin vs COROS HR Accuracy — wrist HR during running differs from HR during barbell work
4. Running + CrossFit Balance — weekly structure before adding metcon volume
5. EMOM Workouts — maintain conditioning without destroying leg freshness before long runs
6. How to Improve VO2 Max — add one structured interval day once easy volume reaches 25–30 km/week

Schedule hard running and heavy leg days on separate days when possible. If you must combine, run easy on the same day as squatting — never tempo or intervals after heavy lower-body lifting.

Keeping Content Updated

Wearable firmware, zone algorithms, and training research evolve. PaceWOD revises articles when device behavior changes materially — for example, when Garmin updates Firstbeat VO2 max modeling or COROS adjusts EvoLab threshold detection. Each article's JSON-LD dateModified field reflects the last substantive edit. Minor typo fixes do not trigger date changes.

If a guide references a calculator output that no longer matches the tool after an update, the article gets flagged for review. When in doubt, trust the live calculator over a static number cited in an older paragraph — and check the article's update date in the page header. Found stale data? Use the contact page to flag it.

New articles enter the library when they fill a gap the tools alone cannot cover — typically a "why does my watch say X when reality is Y?" problem. Training plans are added when a common race goal lacks a structured block with explicit adjustment rules. The goal is a closed loop: tool produces the number, guide explains when to trust it, plan applies it over weeks.