Just to add my 2 cents- whenever I hear about someone doing pushups now the hair at the back of my head stands up. Be really really careful that you have perfect technique. Even if you get a personal trainer, not everyone has a good eye. In my case, my left shoulder was way too extended backwards when doing pushups and the result was twisting my whole spine. I was oblivious- not knowing why my left arm hurt. Now it could be chicken and egg- you could have the nerve issue affect the left arm strength- but the effect is the same. Personally, my pushup days are over and I wsih I had never done them in the first place, regardless of age. I think pushups are good for 18 year old male army recruits and that's it. There are other ways of doing these exercises that are easier to make sure my body is aligned. Like a chest press machine that has a seat with a back- etc.