“Ashtanga” literally means eight limbs. They are described by Patanjali as: Yama (abstinences), Niyama (observances), Asana (postures), Pranayama (breath control), Pratyahara (sense withdrawal), Dharana (concentration), Dhyana (meditation), and Samadhi (contemplation). These branches support each other. Asana practice must be established for proper practice of pranayama, and is a key to the development of the yamas and niyamas. Once these four externally oriented limbs are firmly rooted, the last four internally oriented limbs will spontaneously evolve over time.