Knowledge Base

Physiology

Humans aren’t machines—we’re much more complicated. Exercise physiology involves changes in the body from exercise and rest.

From anaerobic threshold to environmental acclimatization, from FTP to PGC-1 alpha, we explore the science of human performance.

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Xert software analyzing interval data

One Workout — Many Responses

In this workshop, Dr. Stephen Cheung uses Xert software to illustrate how a single workout can impact athletes differently depending on their phenotype.

heart cardiovascular drift

Cardiovascular Drift, with Dr. Ed Coyle

Cardiovascular drift is measured on the bike by looking at a rise in heart rate relative to power. Dr. Ed Coyle shows us the science behind it.

FTP Testing

Structured Workout: 20-Minute FTP Test

Are you ready to suffer? Join us for a climbing time trial up the infamous Alpe du Zwift during which we’ll execute an FTP test.

A triathlete dressed all in black grimaces while riding his bike

The Lactic Acid Myth

There is no lactic acid in the human body. That said, the burn we feel during hard efforts has a lot to do with acid.

Long Slow Distance Ride Analysis in TrainingPeaks WKO

What Exactly Is a Long Slow Distance Ride?

Coaches Trevor Connor and Ryan Kohler analyze ride data from one of Trevor’s LSD (long, slow distance) rides in order to explain the correct execution of one of these fundamental rides.