The word Yoga denotes a concept of discipline leading to union. The body and the mind form a continuum of consciousness and life that, achieving a state of focus and clarity, may unite with the Universal Spirit. Of two general yoga forms, one concentrates on posture and alignment, and the other focuses on mental control and a consciousness differing from waking, sleeping, or dreaming. Each method utilizes stretching postures, breathing, and meditation techniques to calm the mind and emotions, and tone the body. This integration may create an internal atmosphere of peacefulness and intergration, and bring the individual from a state of separation and divisiveness to a unity-of-self that is flexiable, accepting, affirming, and whole.
Integral Hatha Yoga - Satchidanada
Kundalini Yoga: For Body, Mind and Beyond - Ravi Singh
Hatha Yoga Manual I - Samskrti and Veda
Ligh on Yoga - B.K.S. Iyengar