Knees to chest

Jump up and grab a pull up bar with your palms facing away from you, making sure that your hands are about shoulder-width apart. Ideally, the bar will be high enough that your feet clear the ground, but you can still do these if you have a low bar or a doorway bar—they’ll just feel a little bit more awkward.

Pull your shoulders back and down while you tighten the rest of your body into a straight line. Keeping your legs tight together, tuck your knees up toward your chest. Squeeze towards your chest, then lower your legs back down into a straight line. If you’re using a low bar, simply keep your legs bent the entire time.