Asana "Hatha Ratnavali" provides a list of 84 asanas, describing some of them. In the 20th century, Tirumalai Krishnamacharya taught a new system of asanas, incorporating systems of exercises as well as traditional hatha yoga, to influential Indian yoga teachers including Pattabhi Jois, founder of Ashtanga vinyasa yoga, and B.K.S. Iyengar, founder of Iyengar yoga. Together they described hundreds more asanas, revived the popularity of yoga, and brought it to the Western world. Many more asanas have been devised since Iyengar's 1966 "Light on Yoga" which described some 200 asanas; some 300 were created by Dharma Mittra. Asanas have been claimed
Ashtanga vinyasa yoga of a pose (e.g., Janu Sirsasana A, B, and C were done together, then a vinyasa. Likewise Baddha Koṇāsana, Upavishta Konasana, and Supta Konasana were also grouped together without vinyasa between them, as were Ubhaya Padangusthasana and Urdhva Mukha Paschimottanasana. According to Gilgoff, Pattabhi Jois prescribed practicing twice a day, primary and intermediate, with no vinyasa between sides in Krounchasana, Bharadvajasana, Ardha Matsyendrasana, Eka Pada Sirsasana, Parighasana, and Gomukhasana in the intermediate series. Shalabhasana to Parsva Dhanurasana were done in a group, with a vinyasa only at the end. Ushtrasana through Kapotasana also were done all together. The same went