If I exercise, will my insides fall out?

It's been nearly 4 months since I had my gastrectomy, 9 months since I had my baby, and a year since I've done any exercise.  Before the surgery and the baby I'd like to think I did  a lot of exercise.
Which included playing basketball and netball every week, karate (I have a black  belt in Kyokushin)  running and going to the gym.

I have been dying to play basketball since I had my insides chopped up, and since my stomach muscles have finally stopped hurting/burning/itching I decided it was time to get back on the court. I have to admit that the prospect of doing any form of physical activity was terrifying.

I finally got my stomach back.

Last week, I went to the hospital Lab and picked up my stomach. When you undergo any type of surgery (in NZ I'm not sure about the rest of the world) you can request to have your tissue, or body part returned to you. All you have to do is sign a form saying you want it back and when you are discharged from hospital you should get a copy of the form, if you don't have a copy of the form the Lab won't hand over your tissue (you can request another one from the patient file place but it's a pain in the butt) You have to wait until the lab has finished doing tests on it etc. It took roughly 3 months for them to finish with mine. It has been preserved in formalin so I could put it in a jar and keep it forever if I want to, but it looks really gross and kinda creeps me out so I think I will just stick to my original plan of burying it. Here is a photo. Sorry if it grosses you out!