Original sentence: Self-defense formed the basis of numerous martial arts, especially East Asian martial arts, which usually provide self defense classes as part of their curricula
Edited sentence: From the martial arts practiced world-wide two such styles are Brazilian jiu jitsu, and Krav Maga although as these arts are becoming more and more popular they are losing much realism through reinterpretation by multiple instructors and their use in sporting or gaming settings, the rules and regulations of which severely limit their useful relationship to self defense.Self-defense formed the basis of numerous martial arts, but many are presently much less focused on it than they were in days of old.Such styles as karate, kung fu and tae kwon do are more focused on the sports, show, and traditional aspects of the arts, although many good schools also teach self defense classes.Surprisingly few ones teach real fighting techniques for self-defense