Hatha Yoga ( Ha -"Sun", Tha - "Moon", Yoga - "Union") is the term used to describe the physical practices of yoga, including asanas (postures), pranayama (breath control), mudras (symbolic or ritual gestures), kriyas ( purification techniques), yogic diet, and yoga nidra (yogic sleep or deep relaxation). Remember that the practice of yoga is comprised of the eight limbs ( Yama [moral codes], Niyama [self-purification and study], Asana [posture], Pranayama [breath control], Pratyahara [sense control], Dharana [concentration], Dhyana [meditation], Samadhi [contemplation].