What is everyone doing for exercise?

Hey, I have been a lazy dog since surgery on the ninth. I have been walking only 20 minutes a day, and that has been it so far. I have been plagued with lower back pain, an open incision, intense pain in the gall bladder region that radiates from my back to front, and generally feel like crap. However, I plan on doing better and have ordered a treadmill so I can walk at home regardless of the 100 degree temperatures outside! I go back to work next week. I need to feel better... Sher Lo