This is another exercise for the hamstring but this one is performed on a lying curl machine. Choose a lighter weight because you'll be doing one leg at a time. Start by positioning yourself on the machine, grasping the handles to help keep your body tight against the machine. Position the roller pads so that they're just above your heels. Curl your heel up towards your butt until it just about touches it. Do eight to twelve repetitions and then do the other leg.