| Many common ailments and discomforts can be traced to poor posture. If the spine is not properly aligned or if there is tightness or stiffness in the back, the result is often an imbalance in the body. When this imbalance becomes chronic many kinds of disorders arise in the organs, glands and nervous system.
Performing the tada-asana allows one to observe one's posture closely and clearly recognize those problems which get masked or ignored by day-to-day activities. As the posture is held and the breath, mind and body is quieted various effects will surface to indicate difficulties with the spine. Favoring one foot over the other, shifting back and forth, drooped shoulders, tightness in the neck and upper or lower back, and various other physiological disturbances may appear indicating the need for further yoga practice.
The proper execution and continual practice of the tada-asana along with other postures helps to re-train the body to stand correctly and reverse the negative effects of poor posture.
When the tad-asana is performed properly and the mind is focused and free of distraction, the body is experienced as being rooted firmly to the earth and as steady and motionless as a
mountain. | 
The Yoga Sutras