I'm so glad you've got your life back! Isn't is great to be disease and medicine free?? That's great that you're feeling good enough to want to start working out again, especially so soon after surgery.
I do yoga and Jazzercize (which is aerobics, weights and core exercises) and even sleep on my stomach without any problems. Those little stomas are tougher than we give them credit! You might want to ask your surgeon if there's a limit on how much weight you should be lifting. All in all, I think the best advice is to start slow and enjoy!
Dx'd Crohn's in '99 at 28. Proctocolectomy and ileostomy in '06.
Disease-free, medicine-free, and very thankful to be healthy again :)