Deep dives

The physiology
behind the numbers.

Long-form pieces, one subject at a time.

• 05The Shape of the TaperThree percent of free speed sits in the last two weeks before your race, and almost everyone gets the shape wrong in the same three directions.Training20 min
• 04One Body, Eight ScoresEight products read the same night and disagree by thirty points. The sensors are fine. What differs is five design decisions nobody publishes.Measurement32 min
• 03India’s Protein ProblemThe country eats roughly enough protein. It is the wrong protein, and the plate that solved this a thousand years ago is quietly being taken apart.Nutrition30 min
• 02Your Resting Heart Rate Knows FirstWearables really do detect an infection days before you feel it. Then the arithmetic arrives, and most of the alerts turn out to be wine, travel and a bad night of sleep.Signals28 min
• 01Elites Train Easier Than You DoIntensity distribution from real training logs, elite versus recreational. The amateurs are the ones going hard.Training25 min