|Utility:||Basic or Auxiliary|
Sit and grasp cable stirrup. Rest forearm on thigh with palm facing down and with wrist just beyond knee.
Raise stirrup by pointing knuckles upward as high as possible. Return until knuckles are pointing downward as far as possible. Repeat.
Do not allow elbow to rise. Hand may be placed under wrist (as demonstrated) to offer stability and to maintain horizontal orientation of forearm.