I ve been practicing push ups recently because I ll be leaving for the military soon. At first I didn t have any problems, but now on every rep when I go down and then up I feel like a pinched nerve sensation in my left shoulder and wrist.. it doesn t necessarily hurt but it is very uncomfortable and effects being able to perform push ups.. what is going on? I ve heard it might be a back thing and could go to a chiropractor or possibly a nerve in the arm.. it only occurs while performing push ups, not while lifting weights or pull ups or any other physical activity.. thanks for your help. Nic in CA