Crossover symmetry has been amazing program for rehabbing my shoulders twice now after two separate injuries! The second time I started out, going to a physical therapist, but after two months of no improvement, I went back to the system that worked the first time, crossover symmetry, and again it strengthened and removed the pain from my shoulders so I could return to my normal activity and workouts. Also, unlike most online products and services, they actually are incredibly responsive and provide excellent, timely, professional support. Thank you crossover symmetry!