Learning: They’ll learn a firm grip can be opened with one or two hands.

This exersise will change your view on grip. (Which can be opened anyway.) Start Ai-hanmi, Katate dori and finally Ryote dori. By making a drinking movement a firm grip can be broken. The exercise can lead to openings of techniques like: kote-geash / irimi nage..

Tip: The thumb is leading in the direction to break the grip.