Every aspect of a top athlete's performance is now monitored by some form of artificial intelligence. Heart rate, blood sugar, sleep... you name it, somebody, or something, is checking it.
Under the jersey, on the arm, around the wrist, the devices are as discreet as possible but are precious tools in honing performance.
"Today, the number of technological advances, which make it possible to follow the physiological state of an athlete, is exploding," Gael Guilhem, director of the sport, expertise and performance laboratory of the French Sports Institute (Insep), said. The object is to collect personal data so as to leave nothing to chance and perfect each parameter of preparation.