This is both a stretch and strengthening exercise. Repeat the entire movement 3 times

Step 1.

• Place arms straight at your side or slightly in front of you with palms down and fingers open as wide as possible. 
• Rotate palms up as far as possible
• Open palms (extending wrist) as far as possible.
• Hold for 6 seconds.

Step 2. 

• Slowly curl fingers into fist starting with the thumb side first; thumb will be on the outside of the fist.
• Bring knuckles towards your forearm. 
• Rotate fist and forearm down and away.  Knuckles should be facing away from the center.
• Hold 6 seconds and repeat entire movement 3 times.