Fundamentals of High-Intensity Training: USA Cycling

This coach-focused guide to high-intensity training isn’t just another “do more intervals” program. In fact, we reveal just how little high-intensity work your athletes need—and how to make every hard session count. Built around Dr. Stephen Seiler’s landmark research and real-world examples from elite endurance sport, this course shows you how to turn confusing HIT theory into simple, reliable decisions in your training plans.

You’ll learn how to:

Cut through HIT/HIIT confusion by clearly separating hard science from social media advice—so you can explain to athletes why you’re prescribing specific interval work (and why you’re not).
Use the 80/20 polarized model in practice, including when that split makes sense, when to bend it, and how to translate it into actual weekly workout schedules for athletes of all levels and with varying goals.
Choose the right “bucket” of intervals (threshold, VO₂-type, anaerobic capacity, sprint) using Seiler’s science-backed 4×4, 4×8, and 4×16 intervals as templates, then adapt them to your athlete’s level, schedule, and race demands.
Balance signal vs. stress so that hard days stay productive instead of destructive—using concrete rules of thumb for “enough vs. too much” intensity, red flags for autonomic stress, and how many HIT days per week different athletes can realistically handle.
Periodize intensity across a season, from base building to race prep: when to emphasize volume, when to sharpen with HIT, and how to adjust intervals around travel, racing, and real-life fatigue without losing the plan.

This course is designed to give you a clear coaching framework for high-intensity work: simple rules you can trust, session templates you can plug directly into your plans, and language you can use to justify your choices to data-hungry athletes. Instead of guessing which intervals “might work,” you’ll know exactly how HIT fits into your overall strategy—so athletes get faster, stay fresher, and keep progressing year after year.

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