Aikido is a modern Japanese martial art with deep roots in traditional Japanese fighting arts, either empty-handed or with weapons. It evolved into non-violence, becoming a non- competitive martial art with the objective of self-improvement. Aikido is an effective martial art, blending with the force of the opponent without being destructive and, as such, is used by law enforcement agencies in Japan and many other countries. Aikido is categorised as a demonstration martial art by alternating attacks and defences. The sport does not have gender or weight classifications.