My children, 16 and 14, suffer from back pain due to their heavy backpacks. Their shoulders rolled forward, and they complained about their backs all the time. Dr. Callahan instructed them how to wear their backpacks, and taught them what carrying them on their lower backs was doing to the health of their spines. They required minimum adjustments, and are standing taller, and have more energy! They have thanked me for taking them to see Dr. Callahan!