Now the study of yoga begins (Yoga Sutras I, 1)

What Is Astanga Yoga?

To the beginning practitioner, this highly energetic form of yoga may resemble gymnastics or a vigorous form of Tai Chi or other martial art. Known for its flowing qualities, Astanga Vinyasa Yoga (or "Power Yoga") on the gross level builds strength, stamina, endurance and flexibility. At subtler levels, it detoxifies the body and mind by creating a calm and balanced flow of energy (prana). The combination of the two levels results in in "meditation in motion."