This could involve rapidly switching from pronation to supination of the forearm.
From the en.wikipedia.org
Pronation of the forearm should not be confused with medial rotation of the shoulder.
From the en.wikipedia.org
They stand with their knees in rotation and their feet in pronation.
From the orlandosentinel.com
Little was known outside of labs and podiatrist offices about a runner's level of pronation.
From the sacbee.com
Pronation is the normal and natural way the foot rolls slightly inward as it hits the ground.
From the sacbee.com
Things that are sometimes done, like video analysis of your rear foot pronation, may not help.
From the newscientist.com
Pronation dissipates some of the forces generated by each stride.
From the well.blogs.nytimes.com
The foot would react by rolling inward, which is called pronation.
From the sfgate.com
Pronation of the forearm occurs at the radioulnar joint so such a movement does not constitute it.
From the en.wikipedia.org
More examples
Rotation of the hands and forearms so that the palms face downward
In anatomy, pronation is a rotational movement of the forearm at the radioulnar joint, or of the foot at the subtalar and talocalcaneonavicular joints.Kendall FP, McCreary EK and Provance PG. (1993).Muscles Testing and Function. 4th Edition. Lippincott Williams and Wilkins. Philadelphia. ...
(Pronated) The inward rolling of the foot or hand. If the wrist is in a pronated position the palm would be face down.
This is the rotation of the hand so that the palm faces posteriorly. This is not medial rotation as this must be performed when the arm is half flexed. Prone means the hand is facing posteriorly.
Rotation of a body part (usually the hand or foot) backward, inward or downward.
The natural inward rotation of the foot as it relates to the gait-cycle. A normal foot lands on the outside heel and pronates slightly to help absorb shock.
Internal rotation resulting in appendage facing downward
A position in which the knuckles of the sword hand are pointing upward.
The tendency encountered by some runners to have their feet roll inward while running. In this case, their running shoes need to have motion control features.