As explained on the Aikido website, Aikido is an applicable self-defense technique, spiritual enlightenment, physical health or peace of mind. O Sensei had also emphasized on the moral and spiritual aspects of this art, placing great weight on the development of harmony and peace.

To have proper training, communication and cooperation between uke and nage during Aikido practice is essential in order to master this self-defense technique.

During practice, uke need not automatically acquiesce any action that nage takes. Rather, it means that uke must be aware of the conditions that he or she is trying to create for nage so that the latter will be able to practice a particular technique.

While practising a certain technique, uke must also respond appropriately to nage's movements. Nage must be aware that uke is giving him or herself willingly to nage for the purpose of training. While making use of the training opportunity that uke is giving, nage must never take advantage of uke's cooperation.

This is why it is very important that during training, one must not become emotional or angry and never attempt to cause pain or injury to your partner intentionally. As such, it would destroy the moral and spiritual aspects of Aikido - the development of harmony and peace.