Postural yoga began in India as a variant of traditional yoga, which was a mainly meditational practice; it has spread across the world and returned to the Indian subcontinent in different forms. The ancient Yoga Sutras of Patanjali mention yoga postures, asanas, only briefly, as meditation seats. Medieval Haṭha yoga made use of a small number of asanas alongside other techniques such as pranayama, shatkarmas, and mudras, but it was despised and almost extinct by the start of the 20th century. At that time, the revival of postural yoga was at first driven by Indian nationalism. Advocates such as Yogendra and Kuvalayananda made yoga acceptable in the 1920s, treating it as a medical subject. From the 1930s, the "father of modern yoga" Krishnamacharya developed a vigorous postural yoga, influenced by gymnastics, with transitions (vinyasas) that allowed one pose to flow into the next.
Krishnamacharya's pupils K. Pattabhi Jois and B. K. S. Iyengar brought yoga to the West and developed it further, founding their own schools and training yoga teachers. Once in the West, yoga quickly became mixed with other activities, becoming less spiritual and more energetic as well as commercial.
Westernized postural yoga returned to India to rejoin the many forms already in the country, transformed by the pizza effect on its round trip. Western yoga tourists, attracted initially by The Beatles' 1968 visit to India, came to study yoga in centres such as Rishikesh and Mysore. From 2015, India, led by Prime Minister Narendra Modi, held an annual International Day of Yoga, the armed forces and civil service being joined in mass demonstrations by members of the public.