Yoga is simultaneously; self-diagnosis, healing, prevention and maintenance. The reason Yoga produces such a profound state of well-being is that it substitutes for the kinds of activities the human body and mind are naturally designed for. It counteracts the damaging effects of stress. Specifically, it means a "Yoking" of the self by spiritual discipline.
Yoga helps individuals to overcome stress and restores a sense of well-being and calm, thereby recharging the body and the mind.