Try this simple post-shower stretch to release tension in your back and shoulders. Grab a towel and place one hand behind your back, draping it over your shoulder and grabbing it with your other hand. Pull the towel down with your front hand, pulling your backhand up your back. Hold this stretch for 3 seconds, then rest for 1 second. Next, use your front hand to pull the towel farther down, increasing the stretch. Repeat the 3-second hold and 1-second rest two to three more times on each side for an invigorating post-shower stretch.