Stand with your feet wider than hip-width apart, holding the medicine ball at your chest. Brace your abs in tight and twist your torso to the left. Allow your right heel to pivot off the floor and bring the ball up over your left shoulder. Quickly "chop" the ball down and across your right thigh, lunging as you pivot your left heel off the floor. That's one rep. Do 15 reps in a row and then switch sides and repeat.
