HOW: Get set-up sitting upright with a surface next to you to support your elbow, forearm, and hand. With your palm facing down and keeping your fingers straight, extend your wrist, return to starting position and repeat. See the video for other tips and instructions.
FEEL: You should feel the muscles on top of your forearm working. This should not feel like much of an exercise, it is more of a body awareness drill.
COMPENSATION: Do not lose elbow position, try to keep your fingers parallel with your forearm, do not lift your arm off the surface. Do not make a fist as you extend your wrist.