Race buildup is full of inherited folklore. RunNerd grounds periodization, taper, and pacing in physiology — so you decide on evidence, not by mimicking your fastest friend.
You’ve got a race on the calendar and a goal attached to it, and suddenly every decision is in service of a date. The problem is that race buildup is thick with inherited rules — the 20-miler three weeks out, the giant pasta dinner, “never run race week” — and most of it gets passed down without anyone checking whether it’s true.
RunNerd grounds the choices in physiology. It tags the phase you’re in — base, build, peak, taper — and constrains intensity to it, holding the line on easy running during base even when your fitness is asking for more. It maintains the fitness/fatigue/form trio (CTL, ATL, TSB) and steers your taper so form lands fresh-but-not-flat on race morning. It models the pace you can actually hold from your recent long and tempo runs, then prescribes a conservative first-half buffer, because going out too fast is the single most reliable way to blow a race.
It treats fueling as part of training: long runs over ~75 minutes get a carbs-per-hour note, and it watches late-run pace fade as an under-fueling flag rather than a fitness one — so race day uses food your gut already trusts. And when the forecast turns hot, it softens your prescribed paces rather than holding you to a target you set in cool spring air.
The goal isn’t to follow a schedule. It’s to understand why this taper, this pace, this fuel — and arrive at the line having made evidence-based decisions.
This pillar is for the runner training toward a specific race. The articles below cover each decision in depth; this page is the arc.
A structured 16-week block beats 16 weeks of grinding because each phase builds something specific — base for the aerobic engine, build for threshold and VO2, peak for race specificity, taper to deliver it. Skip either end and fitness plateaus.
→ Read: Why a 16-week plan beats a 16-week grind — the case for periodization
Form is fitness minus fatigue. Knowing where your TSB sits tells you when you're in productive overload, when to back off, and when you're race-ready.
→ Read: Fitness, fatigue, and form: the three numbers behind a good taper
Cut volume 40–60% over two to three weeks while keeping intensity sharp, and you don't lose fitness — you shed fatigue. The taper feels wrong and works anyway.
→ Read: How to taper for a race without losing fitness
Going out too fast burns glycogen and tips you past threshold early; the bill comes due in the closing miles. Even or slightly negative splits beat a fast start — for everyone but the elites.
→ Read: Race-day pacing for your first 5K, 10K, or half → Read: Negative splits aren't a brag — they're physiology
The long run builds the aerobic base at an easy effort; turning it into a hero effort every weekend blunts recovery and the rest of your week. Progress its length patiently.
→ Read: Long-run development: the slow drift that builds the engine → Read: Why your long run shouldn't always be your hardest run
Past ~90 minutes you're racing your glycogen. Train the gut on long runs, carb-load sensibly in the final days, eat a practiced breakfast — and bring nothing new to race day.
→ Read: Mid-run fueling: when carbs start to actually matter → Read: Race-week nutrition: carb-loading and what to eat before a race
Heat slows everyone — adjust the goal before the gun and run by effort, not the clock. And if altitude is part of your buildup, plan around the acclimatization cost and the post-return window.
→ Read: Adjusting your race goal when it's hot → Read: Why elite runners sleep high and train low — the altitude playbook