stand on chair, grab the bar, one leg down, and the other at the top where you rest your back on the chair. slowly push the chair far but not too far to minimize the support. do the chin up slowly. as you progress from weeks to weeks, increase the distance between your feet and the chair until you don't need it. if you want clearer view, try to find video of p90x and see how they do chin up. hey, it works for me. at first i can only do 2-3 max but now i can do 9-10 max.