Though asana is perhaps the most widely known of the hatha yoga practices today, its benefits go much deeper than increased strength and flexibility or the ability to perform advanced poses. On a subtle level, asana affects the flow of prana (life force) through the body. Sandra Anderson describes how we can shift our focus from the physical body to the inner realm, and use asana as a means to reorient our minds.

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Sun, Moon, and Fire: Philosophy of Hatha Yoga