The word yoga is based on "yuj"(the root of the word) and means "to link with" or "to unite'. To unite the body with nature, that is hatha-yoga. To create unity within the mind and the body, that is pranayama. To create unity with the mind and the soul, that is jnana. To create unity between the soul and God, that is bhakti. That is the complete yoga system—unity.