Asanas - Yoga Postures
The first four limbs of Raja Yoga is called Hatha Yoga. Hatha Yoga prepares one for meditation. Hatha Yoga includes moral disciplines of Yamas and NIyamas, Yoga Asanas (Positions) and breathing.
Asana means steady position. These positions influence nervous system, glandular system and vital organs to purify the body and balance energy within the body.