To make it in the military, you’ve got to be tough. Recruits go through grueling workouts to get their bodies into top shape, doing drill after drill of push-ups, sit-ups, jumping jacks, pull-ups, and ...

The physical benefits of exercise are well-known — regular workouts promote weight loss, boost energy, and help prevent or manage health problems. Exercise also helps aid in muscle growth, which is ...

Markham Heid is a contributor at TIME. He is the author of The Habit Trap, due out in early 2027. Bethan Mooney for TIME Boot camp-style workouts have been around for decades. But now they come in ...