K4a Individual Lumbricals
Place the hand trigger on the top of your left wrist with your left arm flat on a table.
Extend your right wrist so your hand is pointing upwards, bend all 4 fingers from the knuckle so they hover over the hand trigger. Tap in time to the beat with each finger in turn by flexing each finger from the knuckle joint trying to keep the rest of the finger straight. As you do this your wrist should not move as you do this exercise.

K4b Individual Lumbricals
As K4a but swap hands.