Aikido is a Japanese Martial Art based on the principles of circular motion and non-resistance against an opponent's force, so that anyone, young or old, large or small, of any gender can use it with the least amount of physical force. Aikido was developed by Morihei Ueshiba (often referred to by his title 'O Sensei' or 'Great Teacher'). On a purely physical level, Aikido is an art combining throws and joint locks derived from Jiu-jitsu (a hand-to-hand art) and other throws and techniques derived from Kenjutsu (the art of the sword). Aikido focuses not on punching or kicking opponents, but rather on using their own energy to gain control of them or to throw them away from you. It is not a static art, but places great emphasis on motion and the dynamics of movement.
Aikidoka, students of Aikido, study the art for a variety of motivations, whether it is applicable self-defense technique, spiritual enlightenment, physical health, or peace of mind. O' Sensei placed great weight on the development of harmony and peace. Although the idea of a martial discipline striving for peace and harmony may seem paradoxical, it is the most basic tenet of the art.
Training in Aikido is advantageous because of its emphases on self-defense and cooperation. Aikido stresses defensive techniques and was designed by O' Sensei to not cause any harm to an attacker. Aikido has no competition (e.g. sparring); instead, a cooperative learning environment is created where knowledge and understanding of technique are shared amongst all practitioners.