Hapkido; is a comprehensive self-defense system which encompasses all ranges of fighting and is a combination of a number of different styles, including Judo, Aikido and Taekwondo. Defensive responses can range from "soft" Aikido type moves to "harder" karate-style techniques. Such versatility gives Hapkido practitioners an effective answer to virtually any situation. Although Hapkido can be used in tournament competition, it is not a sport and many of its techniques are potentially lethal. However, Hapkido's philosophical approach to combat is not aggressive. Practitioners only use fighting techniques to counter an opponent's attack. And, in most cases, they attempt to turn the attacker's own force against him. The unique thing about Hapkido is its ability to draw in ideas and techniques from other martial arts, thus making it a truly comprehensive discipline which evolves over time..