Sex is the ultimate exercise, right?
Not exactly. According to a 2013 study published in New England Journal of Medicine, the average guy who weighs 150 pounds burns around 3.5 calories per minute of sex. And according to a 2008 Penn State survey of sex therapists, satisfying sex lasts between three and 13 minutes—that’s less than 50 calories burned per session on a good day.
Nobody has sex to lose weight or build muscle in the first place, but there are definitely some things you can to do up the ante in the bedroom. For example, studies have shown that merely anticipating sex triggers an influx of testosterone into your system. Because elevated testosterone levels increase calorie burn, extended foreplay will help maximize your sex workout, says competitive powerlifter Robert Herbst.
Sex isn’t going to replace leg day, but it can definitely be a healthy part of your active lifestyle, says sex therapist Kat Van Kirk, author of The Married Sex Solution. “Plenty of sex positions engage your core,” Van Kirk says. “Or can be modified to be more of a workout, if not the workout.”