Air, life force, prana, chi, qi, all these interconnected terms are part of understanding the subtle relationship between breathing, mental state and our vital energy. Yoga teaches the art and sciences of bringing these subtle energetics into balance.
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Perfecting the 8 Limbs of Yoga also includes the following classes:

01—Asana – The Awareness of Sitting
02—Pranayama – The Balance of Life
03—Pratyahara – The Withdrawal " Control of the Senses
04—Dharana – Holding One-Pointed Focus of the Mind
05—Dhyana – The Art of Meditation " Its Many Forms
06—Samadhi – The State of Meditative Sameness
07—Yama – The 5 Conscious Restraints for Yogic Action in the World
08—Niyama – The 5 Observances of Individual Conduct
09—Summary – A Summary of the 8 Limbs of Patanjali’s Ashtanga Yoga