"A Yogi is a practioneer of Yoga. the word is used to refer to ascetic practitioneers of meditation in a number of Eastern religions including Jainism, Buddhism, Hinduism, and Taoism."
2. http://www.sciencedirect.com/science? Marian Garfinkel
"The code of conduct includes the practice of highest human virtues like ahimsa (noninjury) and satya (truth), and the promotion of the noblest feelings like amity and compassion" "the discipline of hatha yoga used in the studies described later was developed as a means for meditation: preparing the body and the nervoud system for stillness. Physical strength and meditation: preparing the body and the nervous system for stillness. Physical strength and stamina developed by asanas and pranayama allowed the mind to remain calm."
3. "yogin."Encyclopedia Britannica. Encyclopedia Britannica Online. Encyclopedia Britannica, 2011. Web 03 Mar 2011<http://www.britannica.com/EBchecked/topic/653443.yogin>.