In following the theme with arm care we can't ignore the hands and fingers. There is very little we do without the closure of our hands from opening a door, picking up a bag to any eye hand coordination sport. When joints stop moving they can no longer function which leads to instability and muscle weakness.  

Active Isolated Stretching works with 3 basic principles

• Contract the opposing muscle to send a signal to let go to the muscle you want to stretch
• In order to increase the stretch apply light pressure at the end of range of motion and hold for 2 seconds
• Allow the muscle to relax into a neutral position after each repetition 

Some joints and or muscles that have a lack of function need increased oxygen and blood flow. When you contract or stretch a muscle you push the blood and oxygen out of that tissue. Increased flow happens when the muscle is in a relaxed state. The benefit of physical activity is in the recovery process.  Each stretch should be done 8-10 times.

The Hand and Finger Stretches: 
With your elbow locked and wrist straight work each finger individually from the knuckle closest to your hand while moving into a closed hand position. (stretching finger extensors)

You can stretch all fingers at the same time for a basic warmup. (stretching finger flexors)