When it comes to these pushups, make sure your left and right hands are shoulder-width apart to keep proper form. Keep your left elbow and right elbow in as well so you can activate not only your triceps but also your chest. This exercise is great because it helps you protect your rotator cuff, which is upon your shoulders. Shoot for 15 to 20 reps in this 30-second set. Don't go for high speed, go for perfect form.