V-Sit Ball Tosses
Sit facing each other. You should each be in a V-shape: sitting semi-reclined on your bum with legs and arms in the air, and abs tight. Bend knees slightly and place heels on the floor in front of you. You should be able to touch toes.
Hold a medicine ball (or other object that’s safe to toss). Toss it to your partner at chest level; he tosses it back to you. Keep your abs tight, shoulders back, chest up and spine straight.
Repeat 30 tosses.