With a partner, sit on floor or sit straddled on separate benches. Sit side by side, facing opposite directions approximately 2 meters apart. First person holds medicine ball with both hands.
First person rotates torso away from partner and pulls medicine ball just behind far hip. First person rotates torso to opposite direction and throws ball to partner. Partner catches ball and executes same sequence. First person catches ball and repeats volley. Continue to exchange ball. When finished, face opposite direction and repeat.