I am really new to rock climbing and don''t have the upper body strength to really get up walls. I used to play a lot of football where I was encouraged to be bigger so I am way overweight. Does anyone have a workout program or suggestions to help me improve my upper body strength especially my back and hands as well as dropping the weight off. Just FYI I can''t do pullups but my gym has a bouldering wall a top rope wall and assisted pullups machine as well as anything else you can think of.