they sound the same as some trainers i saw advertised over here in the UK a while back, their marketing was aimed at women wanting a tighter bum, apparently they were a great workout for the glutes, but the woman on the advert just looked like she was walking around drunk

and her bum was wiggling about lol i can only imagine the pain itll give your heels after a walk to the shops in them let alone if you stood off a kerb funny