The Endurance Progression Most Amateurs Get Backwards

Most triathletes and cyclists chase intensity too early in their build. Here's the actual order that works:

1. Weeks 1-4 — Aerobic Base. Zone 2 only. Boring, but this is where your mitochondrial density and fat-burning efficiency actually get built. Skip this and every workout after it is capped.

2. Weeks 5-8 — Volume before intensity. Add duration first. Your body needs to tolerate time on feet/bike before it can tolerate speed.

3. Weeks 9-12 — Race-specific work + taper. This is the only phase where intervals and race-pace efforts should dominate. Taper cuts volume ~40-60% in the final 7-10 days while keeping some intensity.

The #1 mistake: doing threshold/VO2 max work in week 2 because it "feels productive." It isn't — it just borrows fitness from your base phase and pays it back with a plateau in month 3.

If you want this mapped out week-by-week with actual sessions, that's exactly what Race-Ready: Endurance Base Builder does. Drop questions below if you're stuck on periodization for an upcoming race.