Question for those interested in Martial Arts ....?

good question but there are people & MAs that dont attack only defend & a big thing they teach almost everywhere is to keep your defense up while still protecting yourself, it sound funny to think but thats why people move their bodies & swey plus they keep their heads & bodies protected w/ limbs & what not plus you have to be able to bring your punch or kick back just as fast if not faster than you sent it the people you see take people down are either professionals or really good at countering its harder than it looks. plus if it matters i dont believe in sport MAs only real self defense stuff.