Ashwini mudra

Ashwini Mudra
Posture
Ashwa means horse, in this asana a similar movement of expansion and contraction of anus of horse is expected. To achieve maximum movements a specific position is taken which is called 'Ashwini Mudra".

Ashwini mudra
practice of contracting the anal sphincter.
Atman ...

Ashwini Mudra
involves contraction and relaxation of the anal sphincter muscles causing a rise in pranic energy.
Asteya ...

Among the mudras and bandhas, hridaya mudra, ashwini mudra, shambavi mudra, khechari mudra and moola bandha are beneficial for improving the cardiorespiratory and brain function, for cooling, ...

(Mula bandha needs correct posture, otherwise it becomes ashwini mudra! If you slump and roll back on the sitting bones and tail bone you will not be able to get the lift in the pelvic floor region, instead you get a squeeze of the anal sphincters.) ...

See also: Prana, Body, Ashwini, Asana, Mind