Maybe this works in the short-term. In the long-run avoiding painful motion can set up a cycle called fear-avoidance. You may have less pain, but you could end up with more disability later. Many studies have proven this now.
A program to promote active coping strategies along with increased movement is the best thing for you. Trust your therapist. Give it a try, and see if it doesn't make a positive difference in the next six to 12 weeks.