Sitting at a desk, lifting heavy weights improperly, or neglecting to stretch the shoulders can take a huge toll on posture. Even if you think you're sitting up straight, you may still be slouching your shoulders and upper back. Crunch trainer Tim Rich shows us some key stretches and exercises that you can do to strengthen your back and open up your shoulders.
Sit Up Straight! 8 Exercises to Stretch and Strengthen the Shoulders and Back