Going in on Wednesday to have surgery, haven't lost a lot on pre-op diet, but haven't exercised either. What, when, etc. should I plan after surgery to be successful?

I am 10 days post op and all I can do right now is walk but I also have a drain that is majorly uncomfortable and painful so I may not be the best suited to answer this for ya.

I left the hospital the day after surgery and went out for a walk around the block that evening. Slow, to be sure, but made it all the way and felt I could have done more. The next day, I went to the exercise room and began my treadmill routine. 20 minutes at 2 mph at first, then 30 at 2, etc, until I got up to 60 minutes at 2, then 30 minutes at 3, 40 minutes at 3 and again up till 60 minutes. After that, I increased speed every so often when I felt I was ready. Now, 10 weeks after surgery, I am up to 4 miles at 3.5 mph, which takes me about an hour and 9 minutes. I haven't had a stall yet and I'm down 59 lbs. Ya gotta exercise. It's kinda like banging your head up against the wall cause you feel so good when you stop.