Take a step away from the ledge and turn with your back to the surface. The further from the ledge, and the lower the ledge, the more difficult.
Place your hands on the edge, fingers facing forward. The hand position is very important.
Your legs should be straight and your body extended off of the edge so that lowering yourself is possible.
Bend your arms at the elbow and lower yourself down, bearing all the weight on the back of your arms. Then push yourself back up and repeat until your arms are too tired to continue.
