A brief introduction...
Hatha yoga is a branch of yoga that emphasizes physical exercises to master the body along with mind, as well as exercises to withdraw it from external objects.
The word haṭha means "force" in Sanskrit, and may have this association because the early Indians believed that its practice was challenging and "forced its results to happen" on the yogi.
The term "Hatha yoga" connotes a system of supplementary physical techniques within the broader concept of yoga.
The Hatha yoga practice emphasizes proper diet, processes to internally purify the body, proper breathing and its regulation particularly during the yoga practice, and the exercise routine consisting of asanas (bodily postures). The methodology sometimes includes sequences such as the Surya Namaskara, or "salute to the sun", which consists of several asanas performed as a fluid movement sequence.
The aims of Hatha yoga have traditionally been the same as those of other varieties of yoga. They include physical siddhis (special powers or bodily benefits such as slowing age effects) and spiritual liberation (moksha, mukti). In the 20th century, techniques of Hatha yoga particularly the asanas (physical postures) became popular throughout the world as a form of physical exercise for relaxation, body flexibility, strength and personal concentration. It is now colloquially termed as simply "yoga". It has also developed into movements and styles, such as Ashtanga Yoga and Iyengar Yoga.