(Image credit: Shutterstock) If you sit at a computer or spend lots of time commuting, chances are you have tight shoulders, a tight chest, and less-than-optimal posture. You can do various upper body stretches to improve the issue, but I actually recommend one exercise more than stretching: wall angels. The wall angel is a mobility drill that opens up the pecs, promotes healthy shoulder range of motion, strengthens the upper back, and contributes to better overall posture. Doing wall angels regularly can help protect you from pain, injury, and muscle imbalances, and best of all, you won’t need any equipment to do them – just a section of bare wall. How to do wall angels Wall angels are appropriate for beginners and advanced athletes alike, but you should always check in with your doctor before trying anything new. They may recommend avoiding the move depending on your specific circumstances. This exercise is relatively easy to do, but a few common form errors can reduce its effectiveness.…