What is particular to Ashtanga yoga practice is what we call vinyasa, which brings together breathing with physical movement. Each posture is connected with a certain breathing sequence, which comes before and after it. This keeps the flow of energy through the spine open. It also safeguards against injury and prevents energy from stagnating in the body. Vinyasa purifies the body, the nervous system, and cultivates the proper energetic field in the body. It is essential to yoga, we believe, and gives people a direct inner experience of their potential. To feel the energy continually flowing through the spine is the effect of vinyasa. But there is nothing that comes instantly. One needs to practice this system for many years—a minimum of five to ten years—to begin to experience these deep subtle changes in the body.

- Sri K. Pattabhi Jois