I know walking is good but I'm already noticing flabby skin and I don't like it. What can I do now that won't hurt my incisions/abs?

Thx

depending on where the skin is and what you have been released for weight wise, you could start lifing weights, such as if it's arm skin, you can do arm routines, doesn't have to be heavy weights but curls or something like that would help...2-5 lbs to start and make sure nothing hurts.

Consider support under garments. There are plenty of choices on line.