An ista-devata is used by practitioners of the (*) bhakti form of this practice.
One form of this practice was pioneered by a student of Matsyendranatha named Gorakhnath, who founded a religious order known for wearing large earrings. The Self-Realization Fellowship was one of the first Western schools to emphasize this practice. Along with Nyaya, Vaishesika, Mimamsa, Vedanta and Shankhya, it is one of the six darshans in Hinduism. An ista-devata is used by practitioners of the (*) bhakti form of this practice. The fifth of the eight stages in this practice is pratyahara, which involves intense concentration in preparation for later meditation. The Asana stage in this practice consists of a series of physical exercises. For 10 points, name this Hindu practice, co-opted by white people into a form of exercise.
One form of this practice was pioneered by a student of Matsyendranatha named Gorakhnath, who founded a religious order known for wearing large earrings.
Yoga [or Yoking; accept bhakti yoga before mention, as well as any other forms that might be given as answers]