Many studies show that acute back pain will go away in time without specific treatment. Staying active during the healing phase is most important. If the therapist can help you gain a sense of control over your pain then you'll be more likely to keep active.
Most PT programs for back pain are designed for each individual. The choice of treatment is usually up to the therapist. It's always a good idea to ask your PT to explain the program you're following. If you understand why you're doing what you're doing, you'll likely stick with it longer.