People are Practicing Yoga . This Mudra of Yoga called Butterfly Pose or Mudra
Hatha yoga (Sanskrit: हठयोग haṭhayoga, ), also called hatha vidya (हठविद्या), is a kind of yoga focusing on physical and mental strength building exercises and postures described primarily in three texts of Hinduism
Hatha Yoga Pradipika by Yogi Swatmarama (15th century)
Shiva Samhita, author unknown (before 1500 CE or late 17th century)
Gheranda Samhita by Yogi Gheranda (late 17th century)
Many scholars also include the preceding Goraksha Samhita authored by Yogi Gorakshanath of the 11th century in the above list . Gorakshanath is widely considered to have been responsible for popularizing hatha yoga as we know it today.
In Hatha Yoga Pradipika, Swatmarama introduces his system as preparatory stage for physical purification that the body practices for higher meditation or Yoga. It is based on asanas (postures) and pranayama (breathing techniques). Several centuries earlier, Patañjali, a Shaiva of the 2nd century BC, in his treatise on Raja Yoga, Yoga Sutras, had professed seated asanas and pranayam as two limbs of the practice of Raja Yoga.
As a part of Hindu origin, Hindu tradition believes that Shiva Himself is the founder of hatha yoga Hatha yoga was passed down in disciplic succession
In the 20th century, hatha yoga, particularly asanas (the physical postures), became popular throughout the world as physical exercises, and is now colloquially termed "yoga".
Although Patañjali's work does not cover the many types of Yogic practices that have become prevalent, it forms the basis for the theory of Yoga that underlies all subsequent "schools" of Yoga, as it is the basis on which the following practices founded their existences. In other words, all later schools of Yoga presuppose Patañjali's work.
The Sutras, with commentaries, have been published by a number of successful teachers of Yoga, as well as by academicians seeking to clarify issues of textual variation. There are also other versions from a variety of sources available on the Internet. The many versions display a wide variation, particularly in translation. The text has not been submitted in its entirety to any rigorous textual analysis, and the contextual meaning of many of the Sanskrit words and phrases remains a matter of some dispute.
Patanjali was the great Author of Sutras about Yoga