|Utility:||Basic or Auxiliary|
Sit and grasp dumbbell with underhand grip. Rest forearm on thigh with wrist just beyond knee.
Allow dumbbell to roll out of palm down to fingers. Raise dumbbell back up by gripping and pointing knuckles up as high as possible. Lower and repeat.
Keep elbow approximately wrist height to maintain resistance through full range of motion. Hand may be placed under wrist to offer stability and to maintain horizontal orientation of forearm.