Start with the feet a little wider than hip distance apart, keeping the knees slightly bent, and bring the medicine ball to your left shoulder.
On an exhale, pull your abs to the spine, and "chop" the ball down diagonally across your body toward your right knee. Imagine you're chopping some wood at this angle and the ball is your axe — the move is a bit percussive.
Focus on the rotation initiating in your torso.
Control the ball back up to the starting position. This completes one rep.
Remember you are moving with force but control. Don't give in to the momentum of swinging the ball around.