i was doing dumbell shruggs like 2 weeks ago and went to drop the dumbell one of my wraps didn't come lose and it kinda pulled me down,i'm thinking i pulled some thing. my four arm is a little sore near my elbow and when i flex my bicep i cant get a full contraction.it dosen't contract enough to get hard,it dosen,t hurt..much. my grip is kinda weak.like when i'm on the cross over. i cant putt any real weight on it. i worried about not getting a full bicep contraction,any inputt would be helpful,should i try rehab with a gripper or a ball???....thx...iron matt