Everytime i go to the gym now i seem to do more damage than just some soar muscles! Like right now in my right bicep i can feel what i guess is the tendon. Seems like i some how damaged it. Im 15, 5'8(or 5'9 havent been measured in a while) and 140lbs. I want to be lean as can be but now im starting to think that being lean is about worth less unless you are fully grown and already very strong. Would i lose any strength by lowering some of the weight numbers of many of my excercises? Like say i bench 145 untill i can do it real easy or something? I love lifting but always having something hurting(not soar muscles, i like that lol) sucks!!!