Core strengthening. After a time of rest and rehabilitation from surgery a program of core strengthening and stretching can be introduced gradually. But wait for direction from your surgeon before starting any such program.
Exercise. Start with simple exercise like walking. After a few weeks you can add stretching. After 3-4 weeks start resistance exercise to strengthen the core muscles (tummy and back muscles). Ask your surgeon: she or he may have a different time table for you to follow.