I hope you enjoy this 20-minute back and shoulder strengthening class. You will work the often ignored deep muscle layers that stabilize the spine and shoulder area. These body weight exercises build a solid foundation that you can benefit from when using the more superficial muscles while you play sports or go to the gym. The nice stretches included in this routine make it an ideal choice as a quick workout to improve your posture or prevent back and neck pain if you have a desk job and are hunched over a lot.