Yoga can provide much more than just physical fitness. It can bring peace to your mind and body, as well as help with ailments like anxiety, depression, and pain. It's not clear exactly how yoga changes the body in this way, although the parasympathetic nervous system (PNS) may play a role. During yoga, PNS can slow your heart rate and lower your blood pressure. It allows your body to recover after a stressful event like a migraine.