Javair Gillett, Houston’s director of athletic performance, emailed each Rockets player a detailed and customized program to follow — including strength training, flexibility training and cardio. An in-house app, typically used for the offseason, houses videos demonstrating each of the exercises so players know how to do them properly and avoid injury. The Rockets also employed another customary offseason move, giving each player a duffel bag that included resistance bands, pulleys and an exercise ball. “We’re trying to monitor,” Jones said, “and make sure they do the most they can with what they have.”