Sit in easy pose with a straight spine. Bend your elbows so that the upper arms are near the ribs and the forearms point upward. The hands are in gyan mudra with the palms facing forward, a little above shoulder level. Rotate the wrists and arms to make circles, moving the hands outward until the arms are fully extended and the palms face out to the sides. Then bring your arms back to the starting position, making the same wave-like pattern of circles.
You may decide your own pattern of movement according to your own sense of flow and style.
After 3 minutes, speed up the movement to your maximum. Move as fast as lightning but maintain the circling motions for another 10 minutes.
Keep your eyes open.
This exercise brings calmness while simultaneously energizing the grey matter of the brain.