1. PUSHUPS WITH SHOULDER TAPS
Adding taps makes your planted, stabilizing shoulder work even harder, plus it fires up your abs and obliques.
Assume standard pushup position on knees or toes. Make sure your body is in a straight line from shoulder to hip to knee.
Perform one pushup to the ground and up. At the top, touch one hand to the opposite shoulder without shifting your hips to the side.
Repeat, tapping the other hand to the opposite shoulder on the next repetition.