Movement: Extend one arm straight out in front of you with your palm facing up. Take the other hand and gently pull the fingers of your outstretched hand downward. Hold for allotted time and repeat on the other side. Keep your shoulder blades retracted throughout the movement and do not flare your shoulder forward.
Repetitions: Hold for the full prescribed time on one side, then switch sides and repeat. This counts as one set.
Instructions and effects for the Forearm Stretch exercise 
Movement in Sagittal Plane