This classic book is wonderful if you are interested in some of the philosophy of yoga and would like a context for the practice beyond asana and pranayama, which are only two of the eight limbs of yoga. It’s really great. This book includes a translation of the Yoga Sutras of Patanjali with good explanations.
Let me know if you’d like to borrow my copy! Complete with underlinings, notes in the margins, and a few marked pages… if you’re in one of my classes I’d be happy to lend it to you ~Jordan