Which martial art is taught by Katsumi Niikura?

Katsumi Niikura is known for his expertise in Aikido, which is a modern Japanese martial art that focuses on using an opponent's energy and movements against them, often emphasizing joint locks and throws. Aikido is distinctive in its philosophy of blending with the motion of an attacker and redirecting that energy rather than using brute force. This principle aligns with the core teachings of Aikido, making it a unique and effective self-defense system. The choice of Aikido indicates an understanding of the martial art's techniques and philosophical foundations taught by instructors like Niikura.