When the wheels of your vehicle are not in proper alignment, there is abnormal wear and tear on the tires and other parts. Perfect alignment and maintenance allows your car to run properly and get full longevity on all of its parts and pieces. Your body ,and that of your horse, are exactly the same.
Injury and repetitious patterns can change the body of an athlete from ideal functioning as the fascia gradually shortens, tightens ,and adjusts to accommodate misalignment. Fascia is the glue that holds everything together, providing shape, support, and reinforcement to muscle, bone, and movement. It often forms attachments (gets stuck), and needs to be loosened for free movement.
Any body, whether horse, human, dog, etc. that has had proper massage and myofascial release, feels balanced, capable, comfortable, and fluid in movement. Structural integration realigns and resets the body, giving freedom of movement often not seen in years. Every athlete needs maintenance, as much as any car!