Fit Flops

Are these for real?? Sounds like a longshot - but I may be willing to give these a try! "Fit Flops" are supposed to actually tone & strengthen the thighs, calves & glutes - oh, and, to quote directly from the website, "...makes your bum smaller!". They're from the UK and seem to be sold out everywhere. While not the cutest shoe in the world, I just have to have them (if I can find them, of course).