The day of surgery! You will be encouraged to walk on the same day of surgery. We advise you to continue short walks and low impact exercise in the initial days after surgery. It is a good idea to avoid lifting heavy objects in the initial 4 weeks after surgery. After this time there are no restrictions to physical activity or limitations on exercise.
In the long term behavioral change to accommodate a regular exercise regimen is strongly advised. Regular exercise helps to burn calories as well as control appetite and stress. The exercise need not be intense and painful.