Pronating and Supinating?

What is the difference between the two… or Does anyone have a video of either?

THanks
Greg

Extend your throwing arm straight out in front of you so your palm is facing the ground.

Rotate your hand so your thumb points down to the ground and your palm faces out - rotation in this direction is pronation.

From the original position, rotate your hand so your thumb points up to the sky and your palm faces in - rotation in this direction is supination.

Pronation.

Supination.

xv
Nice pics. Shows it well.

This is probably one of the most popular questions here, but a good one.