Isn't it well known that in some martial arts it's better to be small and light because that makes you faster and more agile? I read somewhere that a vietnamese man has around as much muscle mass as an american women does.

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Why aren't women more into martial arts? Why this myth that having less muscle mass and being smaller means you have to be lesser and weaker to those who don't? If all people rely on is brute force then sure but there's far more effective alternatives.