The second principle of Jigoro Kano Judo classifies judo far higher than "just" a martial art, also as an educational system. You can translate this principle with "Reciprocal Help for the mutual progress" or "The mutual prosperity". Kano wants to show, with what attitude and setting the Judoka must learn and operate Judo. Jigoro Kano defined herewith that the partner in the training not only to practice there. UKE plays a role where TORI must take responsibility for him and also for its technical and personal development as well as for himself.
Without UKE, which cooperates openly is the training of judo not possible. With the aspect of mutual understanding and helping, Jigoro Kano has classifies the principle of Do ("way, principle") from the Judo term, as life or principled stand to live together. On the tatami or in competition, this principle appears among others in the control of UKE's fall (Nage) by TORI, or the fact that UKE gives up immediately at strangling (Jime-) and/or lock techniques (Kansetzu waza), TORI will leave the technique then immediately.
This second principle is characterized by the following aspects: