Well, for one thing, the elasticity of the skin is hugely impaired with weight gain.
What weight you gained while your were a child to early 20s, much of the skin would have grown as any other part of our body that grows with growth, such as our bones. Once you have past the age where body growth in height stops, you can consider that the rest of your body will also slow down in that aspect. In other words, when you gain weight as an adult, part of your skin will grow along with the increase in size, but at the same time, the inner layer of your skin that accounts for the elasticity will be stretched and break down, so that part is not going to recover its "tightness" once the fat under it is gone. Think of the pregancy lines. Once you give birth to the baby, your tummy will go back to it some, but not completely, it will stay just a wee bit looser than before, and if you have pregnancy lines--those white lines that indicate a break in the elastic layer of your skin--that area will remain stretched.
So, while exercise will help, the factors that probably will affect the results most will be your present age, for how long were you obese, and how much did you exercise pre-op as well as post-op. If you exercised regularly pre op, obviously, your skin tone and muscle tone will be in a better condition than if you had not, and post op, once you restart your exercise, you have a better foundation to build on.
With an over 100lb loss, you are bound to have excess skin issues to some degree. It will depend on the person whether they feel comfortable with it, don't mind it or find it much of an issue with the help of body shapers, or whether it will bother you no matter what.
Though I know most of you will have to do it out of your pocket unless you have issues like hernia which will be covered by insurance and can get a TT along with it, personally, I think that you should have plastics if you can afford it, as having a body that will help you see that you have come a long way, give you a better esteem of yourself and incentive to take care of your new body, and will remind you that you need to work hard to keep it that way. Even though looks isn't everything, looking better does help you keep your spirits high, and keep you motivated.
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