Most martial arts teach something like this. Typical civilian relies too heavily on the index finger when grabbing for instance your arm, and that makes it eas

Most martial arts teach something like this. Typical civilian relies too heavily on the index finger when grabbing for instance your arm, and that makes it easier to twist out of the grapple, by using the shoulder and the bicep to lever out along the line halfway between the thumb and the index finger. Usually these are stronger muscles than the forearm, possible exception of rock climbers.