It mostly depends on your age and the luck of genetics (also the way your fat is distributed) In my mid thirties, I lost over 150 lbs and had very little loose skin. (meaning it wasn't quite as tight as it used to be, but there was no sagging whatsoever). Now, the second time around (I was banded January 27), who knows? I'm a little older and my skin has been stretched too many times.
One thing I know for sure, excercise will not help with lax skin. But barring cosmetic surgery, (which can leave hideous scars, which also happed to me too :smile:) there are some procedures that can help with minor sagging such as the Titan laser or Thermage. Even lotions that help boost the collegen and elastin in your skin can help a little.
Just my two cents... good luck everybody :smile: