Hatha Yoga encompasses the various physical styles of yoga. It attempts to balance mind and body through physical postures and controlled breathing, as well as calming of the mind through relaxation and meditation. Many of the modern styles of yoga popular in the West derive from the Hatha Yoga school of Krishnamacharya (who taught from 1924 until 1989), including the styles of Ashtanga, Iyengar, Integral, Satyananda and Sivananda.