Arms Stretching - Extension of the Hands Facing a Wall.
Muscles involved: Flexors of the fingers (deep, superficial, and the long flexor of the thumb)
Standing in front of a wall with the arms extended and the tip of the fingers pointing downward, press lightly to the front until the entire palm of the hand is resting on the wall. The arms should be raised until almost shoulder height as the image demonstrates.
By extending the elbows, you will stretch all of the muscles of the anterior part of the forearm, whereas if they remain partly flexed, the effort is centered on the small flexor muscles of the hand and fingers. The way to increase the intensity is to place the hands somewhat higher on the wall and then press lightly with the hand resting on the wall.