I'm going to use a slight variation on this product to get my legs to grow some muscle.
First, I'm going to jam a lamp up my ass. Not a floor lamp, as it's too long and the angle would be all weird. Just a simple table lamp. Then I'm going to get an extension cord long enough to allow me to stand in a bathtub filled with water.
So, with the lamp up my ass and standing in a pool of water, I'll start doing squats so that every time I get to the bottom of the motion, the lamp will short out and electrocute my ass and legs, which should make me jump up pretty fast.
4 sets of 8-10.