As one familiar trainer said, there are no masochists anywhere, and do you really think that if there were magic devices, pills, drinks, belts, then bodybuilders, fitness bikinists, etc. wouldn't you sit on a special diet and exhaust yourself with all sorts of workouts in a weighted gym? After all, season tickets are more expensive than belts.
Doesn't work. If we were working, then only Mr. and Miss Olympia would walk around. And it would have cost several orders of magnitude more. So far, only hard exercise and dreary nutritional control.