Yoga style, B. K. S. Iyengar who emphasized alignment and the use of props in Iyengar Yoga, and by Indra Devi and Krishnamacharya's son T. K. V. Desikachar. Krishnamacharya-linked schools have become widely known in the Western world. Examples of other branded forms of yoga, with some controversies, that make use of Haṭha yoga include Anusara Yoga, Bikram Yoga, Integral Yoga, Jivamukti Yoga, Kundalini Yoga, Kripalu Yoga, Kriya Yoga, Sivananda Yoga and Viniyoga. After about 1975, yoga has become increasingly popular globally, in both developed and developing countries. Practice Haṭha yoga practice is complex and requires certain characteristics of the yogi. Section 1.16 of the Haṭha yoga Pradipika, for example, states these to be utsaha (enthusiasm, fortitude), sahasa (courage), dhairya (patience), jnana tattva (essence for knowledge), nishcaya (resolve, determination) and tyaga (solitude, renunciation). In Western culture, Haṭha yoga is typically understood as exercise using asanas and it can be practiced as such. In the Indian and Tibetan traditions, Haṭha yoga integrates ideas of ethics, diet, cleansing, pranayama (breathing exercises), meditation and a system for spiritual development of the yogi. Goals The aims of Haṭha yoga in various Indian traditions have included physical siddhis (special powers, bodily benefits such as slowing age effects, magical powers) and spiritual liberation (moksha, mukti). According to Mikel Burley, some of the siddhis are symbolic references to the cherished soteriological goals of Indian religions. For example, the Vayu Siddhi or "conquest of the air" literally implies rising into the air as in levitation, but it likely has a symbolic meaning of "a state of consciousness into a vast ocean of space" or "voidness" ideas found respectively in Hinduism and Buddhism. Some traditions such as the Kaula tantric sect of Hinduism and Sahajiya tantric sect of Buddhism pursued more esoteric goals such as alchemy (Nagarjuna, Carpita), magic, kalavancana (cheating death) and parakayapravesa (entering another's body). Mallinson, however, disagrees and suggests that such fringe practices are far removed from the mainstream Yoga's goal as meditation–driven means to liberation in Indian religions. The majority of historic Haṭha yoga texts do not give any importance to siddhis. The mainstream practice considered the pursuit of magical powers as a distraction or hindrance to Haṭha yoga's ultimate aim of spiritual liberation, self-knowledge or release from rebirth that the Indian traditions call mukti or moksha. The goals of Haṭha yoga, in its earliest texts, were linked to mumukshu (seeker of liberation, moksha). The