I was arm wrestling a few days after new years at a party, I worked out the next day and the first set of bench my shoulder was hurting where it meets the bicep. It has been 5 weeks since I last tried to lift and there is still pain and occasional popping in my right shoulder. Every 2 weeks or so I do a couple sets of pullups 15-20 per set and I did that yesterday no pain today but if I swing hard as if I were going to punch somone it hurts. I was wondering if somone could tell me what this may be, if I tore or pulled a tendon would I have been able to do 20 pullups, is it the rotator cuff? Any help would be appreciated, Thanks.