Aikido is a Japanese martial art that aims to train a person's movements and character in harmony with the rules of nature. An estimated 1.6 million people practice aikido worldwide, drawn by its spiritual and physical benefits. Aikido was developed in the early 20th century by the late grandmaster Morihei Ueshiba. Through interviews with the current lineage holder, a kinesiologist, and practitioners, we unveil some of aikido's secrets and find out what makes it so unique among martial arts.