Re: exercise, cream and sagging skin

Does anyone have any experience with how exercise or different creams has helped with the issue of possible sagging skin after lots of weight loss? I am 37, 5'4", weigh around 250, my surgery is set for Oct 23 with Dr English at Fla Med Ctr. lap-rny. Wanted to know if exercise would be a big factor in stopping the sagging, or if anyone had good creams to help with that, etc...