I just bought ankle weights in 2.5 pounds on each leg. I bought this in hopes to help slim down my leg and firm up my butt. Someone at the retail store said that that it can built up your calves. I don't want that, in fact, I wanted to slim it down a bit. Right now, they are not hard as a rock because of drastic change of lifestyle, they kind of went soft. Can anyone tell me what does ankle weight supposed to do for you?