Astanga has its roots in the 8 steps of the Yoga Sutras, and has been taught and described by Sri K. Pattabhi Jois or as he respectfully was called; Guruji. The practice of Astanga yoga is physically demanding, working gradually through different sequences of Asanas of increasing complexity. The practitioner starts out with the Primary Series and after getting skilled in it moves forward to the next level. The Primary Series consists of 5 Sun Salutation A and 5 Sun Salutations B and is followed by several standing poses and then a sequence of seated and lying stretches and twists. It creates a strong physical body and the combination of the poses is believed to be detoxing and rejuvenating for body and mind. Working strongly on focus, concentration and balance, with the goal of obtaining a calm mind and relaxed body.