Change must be structured for many reasons, but one is the way the brain works. Old patterns get reinforced unless a new discipline is introduced to override the old patterns. People who have never exercised on their own because of a lack of self-discipline cannot be trusted to all of a sudden begin to get in shape because the doctor says they need to. They usually need the structure of regular times with a trainer or a class in order to make the program sustainable. New brain patterns must be developed from outside structure.
