Lacdeloo, if you got a bruise it is because your jump was not as perfect as you thought. I have been diving for years and would rather dive than jump because you actually have more control of your body. If you bruised your bum it is because you did not go in perfectly straight. Even a slight bend at the waist can cause problems. I once jumped from a cenote in Mexico (from a hole in the roof of a cave into water) about 65 feet and bruised my tailbone bad enough that I could barely sit for over a week. The best way to jump is to step off of the platform with you hands to your side and you feet pointed. Last week Janet and I watched people jumping from Rick's for about an hour and saw 3 people who did not land well at all. No one was "hurt" but I'm sure they were black and blue the next day.
Regards,
Bob