In order to actually know how to fight, you have to train fighting.
But basically, this. Yeah. Self Defense in the sense of faring well in violent encounters is a politic way of saying "learning to win fights efficiently and effectively."
Also, as has been said, fighting itself isn't the only part of self defense, crime prevention or what-have-you.
I always say that my wife, with no martial arts training, at 110 pounds, is probably ten times more fit to teach a "Self Defense" course than I am, having far more knowledge and experience of everything to do with violence and avoidance than me, with the exception of actual fighting.
But in that mindset, looking before you cross the street is better self-defense than training in the martial arts. Heck, in that sense, sunscreen, kale, annual medical check-ups, cancer-screenings, and especially careful maintenance of your cardiovascular health are more effective self-defense.
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I think a lot of times, what we as martial artists love is fighting, it's not knowing we have an effective self-defense system. I mean, I love martial arts, but really, I don't practice because I feel the need for it for my own personal safety. Until two years ago, we lived in one of the cruddiest neighborhoods in a small city with what is apparently considered a "High" violent crime rate. I never felt unsafe. I knew my neighbors, we helped each other out, and you could pretty much tell there was nothing in our apartment worth breaking in to steal, plus everyone nearby knew that if they needed blankets or a shovel or something, asking was easier...
Just saying, for the average person, if you're not a moronic jerk with testosterone poisoning, a violent encounter is
not going to be what ends your life, so why are we practicing martial art? Because we just want to, that's why. I mean, in a sense, it's
all sport martial arts, the only difference is whether you practice your sport for competition or just for the sake of the sport...