Hatha yoga might be the most original type of physical yoga asana practice, that we know of. Hatha yoga is described as early as 1500 in the book called Hatha Yoga Pradipika by Yogi Swatmarama. Hatha meaning sun and moon, which can be interpreted as working towards balance, and the acceptance of the need for opposites. In Hatha yoga you work separately on each classic yoga pose, finding calm and balance as you work the physical body, preparing for meditation. This practice holds a foundation of finding calm and grounding, essentially preparing us for meditation.