Aikitaiso

Descriptions of the Aiki-taiso from Rod Kobayashi-Sensei:

10. Joho Kosa Undo
Stand naturally with your hands at your sides. The "One" count is relax and swing your arms forward from the fingertips until the hands overlap in front of your face. Drop them immediately so they return to your sides.
Repeat this five times with the left wrist in front, then five times with the right wrist in front.This exercise helps you to lead the attacker who is holding both your wrists from the front upward and inward to jam the grip to the point where it is weak and less effective.