MUSCLES ENGAGED Hamstrings The hamstrings play a crucial role in many daily activities, such as, running, jumping, walking and cycling. Strengthening your hamstring muscles help to protect your knees from injury by absorbing the stress placed on the knee. Weak hamstrings can lead to knee injury. 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). Exercise Instructions Step 1 Stand tall with your shoulders pulled back and your arms relaxed at your side. Step 2 Bend at your hip and lower your body down to the floor. Walk-out into a push-up position and perform a single push-up. Step 3 Walk yourself back to the starting position, stand back up tall and repeat.