MUSCLES ENGAGED Chest Strengthening the chest muscles will help you push things easily and effortlessly. The muscles in your chest help stabilize your shoulder joint, which reduces your vulnerability shoulder joint injuries. Working your chest muscles also has an aesthetic factor (body contouring). Triceps Triceps are an often forgotten muscle group. Triceps are located on the opposite side of the biceps at the back of the upper arm. Well strengthened and defined triceps make the arm look bigger and sleeker (reducing the "flabby arm" look). Exercise Instructions Step 1 Start in a push-up position with your hands slightly wider than your shoulders and your feet shoulder width apart. make sure to keep your back flat and your core engaged. Step 2 Slowly lower you body down as one unit trying to keep a straight line from your shoulders to your toes. Make sure not to sag your back or relax your abs during the descent. Step 3 Press you body back up to the starting position and be sure to keep your back flat and your core tight throughout the entire range of motion.