There are eight limbs of Yoga. The eight limbs of
Yoga are also called as the Ashtanga Yoga.

Compiled
by Maharishi Patanjali in the Yoga Sutras, the Eight Limbs of Yoga are a
progressive series of steps or disciplines which purify the body and
mind, ultimately leading the Yogi (one who practices Yoga) to
enlightenment. While the physical part of yoga is certainly of
significance, it is only one of the eight conventional limbs of Yoga
practice, all of which have meditation of God as their rationale. These
are the eight limbs of the complete yoga system as they are found in the
famous Yoga Sutras of Patanjali.