Change leads to disappointment if it is not sustained. Transformation is sustained change, and it is achieved through practice.
B.K.S. IyengarThe practice of yogasana for the sake of health, to keep fit, or to maintain flexibility is the external practice of yoga. While this is a legitimate place to begin, it is not the end. Even in simple asanas, one is experiencing the three levels of quest: the external quest, which brings firmness of the body; the internal quest, which brings steadiness of intelligence; and the innermost quest, which brings benevolence of spirit.
B.K.S. IyengarWhen an asana is done correctly the body movements are smooth, there is lightness in the body and freedom in the mind.
B.K.S. Iyengar