There is no fighting in Aikido. However, that doesn't mean that Aikido can't be very mean. My understanding of a fight is that both individuals are actively attacking and defending. In Aikido, we only defend. If you think of fighting, then your body tenses up which is no good in Aikido. My Sensei taught us to be happy. When you are happy, you can relax, when you can relax, the energy flows freely from you and through you.