I notice this when doing DB bench press. If I want to go really heavy, I have to get someone to help me get the DB's up to the top position initially. After that I have them step out of the way and I can get around 8 reps. Its that initial kick them back and get them up that gets me. And its the left shoulder that I have trouble with. Not pain, it just seems "weak".
Today I asked someone for a spot who also happens to be a good certified trainer. He said that my left arm goes out wider on my benching. Never had a shoulder injury that I can remeber. Anyone have thoughts? (Corrective)Advice?