How do i turn on my back when doing chin-ups? I just don't feel anything in my back activating while my arms get tired as fuck. Yes,i can do 3x5 but still. I did try out the "drive" elbow into the ground method but doesn't seem to do much. Maybe my back muscles are so weak my arms pick up the slack? I do sit a lot in front of the 'puter every day which may have resulted in a weak back however i also played football every week for several years.