Book excerpt: Hatha Yoga Pradipika is among the most influential surviving texts on hatha yoga. The text describes asanas, purifying practices, shatkarma, mudras, finger and hand positions, bandhas, locks, and pranayama, breath exercises. The book explains the purpose of Hatha Yoga, the awakening of subtle energy kundalini, advancement to Raja Yoga, and the experience of deep meditative absorption known as samadhi.