Does Brazilian Jiu Jitsu have certain rules to protect it? Like falling to the ground? As long as there are three limbs on the ground, you can't kick? And there are many rules to play on the ground, can't you play? Can't pick your crotch? Can't get into the eye? You can't catch jujitsu, and you often expose your crotch to the other side and surrender according to the rules? Of course other martial arts suffer? Can only be regarded as a kind of competition.