While workouts like high-intensity interval training (HIIT) have only been popular since the early 2000s, many other types of exercise have been around much longer. Pilates, for instance, began nearly ...
Markham Heid is a contributor at TIME. He is the author of The Habit Trap, due out in early 2027. Photo-illustration by Bethan Mooney for TIME You’ve probably seen groups of people practicing tai chi ...