7 days post op and I want to workout

I just bought the Wii EA Sports Active.  I figured it at least had a walking workout.  No walking workout, but I did easy step aerobics at low intensity and am doing fine.  I feel great and lost 100 cals.  I figure if i do this or actual walking for at least 30 mins for the first 6 wks i should be fine.  I have lost 19 lbs so far.  My stomach gets really sore when I am not moving, i.e. sleeping, sitting at desk working or watching tv. When I am out like shopping at wallys world, i count that as a 30 mins walk since i am usu there at least 30-45 mins.  At home I dont do any bending or lifting.