Hatha Yoga is a tough and exacting form of yoga, which lays much emphasis on physical processes like
asanas and
pranayama. Sadhakas of hatha yoga reach self- realization through hard and rigid discipline of their bodies and minds.
The word hatha as an adverb means ‘against one’s will’. This branch of
yoga is named thus because it demands rigorous and gruelling self-discipline in order to attain the objective.
Hathayoga Pradeepika is a celebrated book on the subject by Svatmarama.