Jen Renfroe, senior vice president of group fitness for the Crunch Fitness gym chain, says that over the past two years, more men have taken Pilates-based classes as a complement to their traditional strength-based or high-intensity interval workouts. “There’s an unspoken bond when you see another guy in the studio,” he says. “It’s like we’re in on this secret workout that makes you strong and feel good. But with more men, especially athletes, finally talking about how great it is, I don’t think it will stay a secret that much longer.”