A muscle which produces the motion of supination.

a muscle (especially in the forearm) that produces or assists in supination

(L. supinare, to place on back). Denoting a muscle that, upon contraction, rotates the forearm and hand with the palm facing anteriorly when the hand and forearm are in the anatomical position.

When the runner's foot strikes the ground, the medial arch is lifted away from the ground while the heel is on the ground (see "Running Shoes").