Pratyahara is situated directly in the middle of the eight limbs, its central position indicates that it is the point where the outer can become inner (and also the reverse). Pratyahara is the bridge limb that shows you how to use asana and pranayama to find dhyana and samadhi, how to use your postures for concentrating your mind, for accurately tuning in, for reading, and responding to your mental states.
Thus you can cultivate a more intimate relationship to your experience of sensation as a way inward towards concentration, towards buddhi, mental clarity, and thus towards self or individuation. Using your body and your breathing to change your relationship to the sensory information you receive helps you bring more mind, more psychology, more honesty and authenticity to your awareness and your self-reflection. You use these new dimensions, this new inner directed consciousness to find more accurate physical alignment that brings deeper significance, more beauty and more grounded weight to your postures and movement.
Lastly, one final unexpected gift from the fifth limb emerges from another less common translation of the word pratyahara: to recover the senses. To recover the senses as opposed to withdrawing them conveys a different flavor to pratyahara by suggesting that the senses are “lost” or somehow need to be re-found or reclaimed…
Sensual could then be an integral part of pratyahara, to cultivate your sensuality could mean to thoroughly apprehend and appreciate what you, your whole body, your nose, eyes, ears, heart, loins, and viscera takes in from the world as means of accurately reflecting soul in your depths and spirit in your aspirations. In fact purusa or spirit, the highest conception of samkhya yoga is also known as The Enjoyer. Who better than purusa to be essentially sensual, to consummately know and appreciate the myriad forms of creation by adopting the ultimate asana, the seat or the perspective of the supreme enjoyer, the one who takes it all in pure, bold, unashamed and unblemished enjoyment.
Excerpt From Elephant Journal Article, Pratyahara: Withdrawing The Senses And Truly Enjoying Your Yoga, By David Garrigues