
Editor's Picks

Stop Prescribing Zone 5: Build Better VO₂max Intervals
By Taylor Warren
A practical guide for coaches to get more VO₂ adaptation from the same (or less) suffering.

How to Build Fatigue Resistance for Ultras: Lessons from Molly Seidel’s Training
By TrainingPeaks
How does a world-class marathoner adapt her training for the grueling demands of a trail 100K? In this technical breakdown, CTS Ultrarunning coach Cliff Pittman answers a series of questions to pull back the curtain on Molly Seidel’s preparation for the 2026 Black Canyon 100K. Focusing on the critical concept of “durability” — or fatigue […]



































