I will be having tummy tuck/armlift/chestlift surgery this summer and want to come out of surgery looking as good as possible. I am 25 years old and currently weigh 215lbs (I used to be 370lbs) I plan on doing the Insanity workout to burn excess fat & after that I plan on lifting weights to gain muscle. Is this a good plan to take with me being about 4 months away from surgery? If I build up a sufficient amount of lean muscle underneath my loose skin, how well will it show after surgery?