Over the decades he taught in the United States, Sensei Shuji Maruyama developed the four basic principles that are the foundation of how we train today. Kokikai Aikido is an evolution of classic aikido, emphasizing Minimum Effort for Maximum Effect. The traditional techniques become a more accessible and effective version of self-defense.
The four principles, coupled with techniques that utilize distance, timing, momentum, and gravity, make Kokikai Aikido effective regardless of the size or strength differences in a violent encounter.