MUSCLES ENGAGED Back (middle) Middle back muscles are very important as they help to support and strengthen the core muscles at the front of your body. Back (upper) You can’t see your back without a lot of effort, but this doesn't mean you shouldn’t train it. Back exercises consisting of both back stretching and back strengthening is very important to your health and overcoming back pain. Exercise Instructions Step 1 Start in a kneeling position and place one hand behind your head. Step 2 Tuck your knee in towards your opposite knee and then open up and try to look over your shoulder. Step 3 Lower your elbow back down towards your knee trying to be smooth throughout the entire range of motion.