Did you see that episode of seinfeld with the shoes?
I saw this really funny episode of Seinfeld where this guy wore these shoes that were supposed to raise the jump height by working specifically on certain leg muscles that were used in jumping. By making the shoes in such a way where you walked all day on the specific muscles that make you jump higher thus working on the muscles in a natural workout that doesn’t take much conscious effort, your vertical jump rate was increased. What made this funny wasn’t that the shoes didn’t work (as I believe they did) but that George didn’t wear them long before trying to demonstrate their usefulness!