To help sculpt her famous figure, Jennifer Lopez exercises with trainer Gunnar Peterson on the TRX suspension trainer, a portable fitness tool that weighs less than 2 lbs. and can be anchored to a door or any secure point for a total-body workout. The singer-actress has "done push-ups on them, rows, hamstrings – there's not a body part that you can't hit using it," says Peterson. "It allows you to work with your body weight depending on the angle and how much you pull on it."
