what is yoga?

http://www.wellnessbyyoga.com/
Yoga, by a literal meaning "Yoke" means join, unite or attach, a technique to synchronize the entire human system for the best health and performance. It’s a proven ancient technique from India to unite physical, mental and spiritual discipline. Practicing right yoga postures lead to the attainment of a state of perfect wellness & spiritual insight. Regular practicing of Yoga improve the immune system and empowers to provide the strength fighting incurable.