The Yoga Sutras

http://www.soundstrue.com/store/the-yoga-sutras-619.html
To help integrate this wisdom into our modern life, Bachman offers a unique approach. Instead of reading each sutra sequentially from beginning to end, he focuses on and discusses 51 key concepts. By exploring these principles with him and learning to chant the sutras in Sanskrit, the essence of yoga philosophy is revealed—helping us open to its heart and soul.