I am trying to find a source of body weight exercises. By now I "cook" my push ups like 10 different ways. Crunches, supermans. Yesterday I was looking at this banner with a split in it. "Elasticsteel" There is book on the front page, where he is doing weird exercises. Does anyone know what they are and if they work? This is the link to it herehttp://elasticsteel.com