Pratyahara Blog from Beth

Pratyahara in practice
Extension and expansion always stay firmly rooted in one’s center. They originate in the core of one’s being. When most people stretch, they simply stretch to the point that they are trying to reach, but they forget to extend and expand from where they are. When you extend & expand, you are not only stretching to, you are also stretching from.
Overstretching occurs when one looses contact with one’s center. If the stretch extends from the core and the foundation of the asana, it creates space within the body and the stretch is even throughout the whole body, there is no strain at all. This does not mean that there is no exertion. There is exertion, but this exertion is exhilaration. When one stops straining the brain is passive.
When one ceases grasping outward with the mind, with the eyes and with the extremities, one cultivates a knowledge and awareness of the deeper parts of the body and the deeper parts of the consciousness. This becomes spiritual yoga.

Adapted from Light on Life, B.K.S. Iyengar