Wrist & Midcarpals

Bending the joint resulting in a decrease of angle; moving the palm of the hand toward the front of the forearm.

Straightening the joint resulting in an increase of angle; moving the back of the hand toward the back of the forearm.

Medial movement toward the midline of the body; moving the little finger side of the hand toward the medial side of the forearm.

Lateral movement away from the midline of the body; moving the thumb side of the hand toward the lateral side of the forearm.
Notes
Also see Thumb and Fingers. Mentioned articulations occur during concentric phase of exercise video examples.