in this picture i'm the one with the green checkered board shorts!! cheee jumping of a wall into the water...i enjoy doing this a lot...through many past experiences good and bad...i've learned that if you tuck (keep knees into your chest you rotate faster..if you leave them extended you rotate slower...on some big jumps you can get away with not tucking and still get your flip down but on the mini jumps like into a regular pool i've learned the hard way that you have to gain momentum and tuck hard so you rotate faster...this is because your center of rotation is closer to the axis or turning point so you can rotate faster in that short amount of distance and time...when you leg is extended it is hard to rotate so you go slower and can back or belly flop before you complete your flip!