One of the legal but little-known practices of pelotons is taking caffeine before and during races. It is estimated that based on their weight, guys can consume between 280 and 300 milligrams.

Caffeine acts as an anti-fatigue agent and helps with concentration. But you shouldn't overdo it, says Groupama-FDJ doctor Jacky Maillot. "To think that it excites you to the point of causing falls…” Serge Niamké, Decathlon-AG2R doctor.