Challenging activities stimulate the body's sympathetic nervous system, which provokes what's known as the "fight-or-flight" response. This puts your normal body functions on hold (such as digestion), while your body prepares for survival. Yoga creates the opposite reaction. Relaxing your body and mind stimulates the parasympathetic nervous system, also known as the "rest-and-digest" response. Your internal organs return to their normal functions and your body can once again perform at its peak. Regularly practicing relaxing yoga poses can keep your body and mind in tip-top shape!