Physical activity allows diffusion of nutrients into the injured disc space and helps it stay healthy. Significant inactivity deprives the injured disc of the nutrition it needs, and this can lead to further degeneration and pain. Additionally, activity and exercise maintain the exchange of fluids in spinal structures and reduce swelling that naturally occurs in the tissues surrounding an injured disc. This swelling can further irritate nerves that are already affected by herniated discmaterial, which is highly inflammatory. The natural stimulus for the healing process is active exercise. Active exercise means we use our nervous system to tell the muscles what to do, and it requires dedication to an appropriate, comprehensive exercise and rehabilitation program.