Yoga is an old discipline from India. It is both spiritual and physical. Yoga uses breathing techniques, exercise and
meditation.
Yoga can translate as "the cessation of the modification of the mind" . A person doing yoga will move from
one posture (called asana) to another.
The fundamental purpose of yoga is to foster harmony in the body, mind, and environment. Yoga professes a complete
system of physical, mental, social, and spiritual development.
Learn more on the Wikipedia