"To injure an opponent is to injure yourself. To control aggression without inflicting injury is the Art of Peace." O Sensei Well, sometime it works differently source: http://www.aikidosangenkai.org/
Bushido - Way of the Warrior. A Code of Life Conduct (katana is optional, but not required)
iaido - The word iaido approximately translates into English as "the way of mental presence and immediate reaction." It was coined in the 1930s, replacing the earlier and more literal name battōjutsu (抜刀術 "art of drawing the sword").
"Aiki Taiso is an exercise that you do by yourself that is directly related to Aikido techniques. Aiki Taiso is important for aikido practice"