YOGA: It's not just posing
While many people are introduced to yoga as an exercise to stretch and strengthen the body, it is actually an eight-part meditational, physical and spiritual practice. The practitioner uses control of breath, body and emotion to gain insight into how he or she is connected with the whole of creation.
Yama: Universal morality
Niyama: Personal observances
Asanas: Poses or physical practice
Pratyahara: Withdrawal of the senses
Source: Heartwood Yoga Retreat