The basic brickwork. Correct sitting . . . stillness and balance and relaxation. Relaxed stillness, not tense. Without that stillness, the yoga movement has no meaning. It's just another discharge of kinetic energy. The basics: correct sitting, correct breathing. Correct breathing, correct breathing! Relaxation of all muscles and nerves and mind. Emotional purification. That is, calming down, not going to extremes of depression and exhilaration, and depression and exhilaration. Breath awareness. Unbroken breath awareness.