Yogi Swatmarama was a 15th and 16th century yogic

Yoga

Yoga is a physical, mental, and spiritual discipline, originating in ancient India. The goal of yoga, or of the person practicing yoga, is the attainment of a state of perfect spiritual insight and tranquility while meditating on Supersoul...

 sage in India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

. He is best known for compiling the Hatha Yoga Pradipika

Hatha Yoga Pradipika

The Hatha Yoga Pradipika is a classic Sanskrit manual on hatha yoga, written by Svami Svatmarama, a disciple of Swami Gorakhnath. Said to be the oldest surviving text on the hatha yoga, it is one of the three classic texts of hatha yoga, the other two being the Gheranda Samhita and the Shiva...

, which introduced the system of Hatha Yoga

Hatha yoga

Hatha yoga , also called hatha vidya , is a system of yoga introduced by Yogi Swatmarama, a Hindu sage of 15th century India, and compiler of the Hatha Yoga Pradipika....

. Hatha Yoga focuses on purification of the body as a path that leads to purification of the mind (ha), and prana

Prana

Prana is the Sanskrit word for "vital life" .It is one of the five organs of vitality or sensation, viz. prana "breath", vac "speech", chakshus "sight", shrotra "hearing", and manas "thought" Prana is the Sanskrit word for "vital life" (from the root "to fill", cognate to Latin plenus...

, or vital energy (tha).
Gorakhnath, who was probably Swami Swatmarama's guru, belonged to a yoga sect called Nath pant

Nath

The Sanskrit word nāthá or नाथ, is the proper name of a Hindu initiatory tradition and the word itself literally means "lord, protector, refuge"...

. Nath sect came into existence to save the society from the misuse of tantra shashtra (black magic and sorcery).