Are you feeling tightness in your upper, mid-back? Your latissimus dorsi, or lats for short, might be the culprit. Stretching this muscle can help alleviate pain in your upper back, as well as help keep your body flexible. Here’s what you need to do.
Reach your left arm around your back as far as possible. You’ll feel a stretch in your right latissimus dorsi. To deepen the stretch, use your other hand to pull your left arm behind your back.