It's no surprise that J Lo works hard for her body. She seemingly glows from the inside out and looks fit AF. Today you get to sample a full-body workout from her trainer, David Kirsch. Get ready for your muscles to shake and burn — it's intense. You can do this workout without equipment, but you can make it more challenging with gliders (or hand towels) and a set of light dumbbells. Press play and get ready to werk!