  Classification of the Martial Arts
Many different criteria have been developed to classify different fighting
systems, but most of them are controversial or inadequate. For example, some
Chinese systems are classified as either "internal" or "external," but to
understand what this means requires familiarity with the concept of qi, or chi.
This concept is not internationally applicable to all systems.
Other criteria use the distinction of "hard" versus "soft." A hard system relies
on attack and force and a soft system relies on leverage and avoidance of attack
to defeat the opponent. The Shotokan school of karate may be described as
"harder" and judo as “softer.” However, most systems have both hard and soft
features. For example, a judo practitioner uses full physical strength when
throwing an opponent.
Another set of criteria use the concepts "striking" versus "grappling" to
classify the fighting system. The former focuses on punching and kicking, as in
boxing and taekwondo, and the latter on clinching and holding, as in wrestling
and Brazilian Jiu-Jitsu. In this case, some systems actually do restrict their
techniques to only striking or only grappling. However, many other systems use
both approaches. These systems include Sambo or San Shou. Another system, Muay
Thai, basically consists of a striking art, but frequent use is made of the
grappling technique known as the Muay Thai clinch.
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