Bellicon Rebounder
Who knew that bouncing on a trampoline could be considered exercise? Well, apparently the German engineers behind the Bellicon Rebounder. These unique mini-trampolines provide a workout for all of your 638 muscles simply by bouncing up and down, and use highly-elastic bungee cords instead of metal springs for suspending the mat, giving you a "floating" feeling that other mini-tramps just can't provide.