Sometimes you don’t even have to lift a medicine ball at all to get some use out of it. It can act as an unstable surface that you balance on. Doing push-ups with one or both hands on a ball (or balls) can make your rotator cuff muscles work harder, helping to strengthen your shoulders and prevent injury. You can put your heels on one or more balls and do glute bridges or hamstring curls to build stability in the hips and core. ~ Berceste