Every night throughout training camp, Hunter Knighton took a pill given to him by athletic trainers at the University of Miami.
When he arrived on campus for football practice each morning, he met with trainers to make sure the pill — designed not to alleviate pain or heal anything but to monitor his internal body temperature – was still in his system. Just before taking the field, Knighton and up to 29 of his teammates pulled on harnesses outfitted with small GPS trackers. And after practice, most of the players watched specialized high-definition video footage recorded by a pair of drones that hovered over the field.