Why are nerds and eccentric introverts such great combatants?

Why is it that nerds & eccentric introverts brave, ferocious, and far better fighters than highschool athletes (gridiron American football, lacrosse, basketball, tracks, gymnastics, tennis, etc.)? For example, all the introverts that I saw are all lean muscular super-skilled martial artists, wrestlers, or child warriors who often brutally beat up gridiron football boys and athletes of American football for fun.
Why are nerds and eccentric introverts such great combatants?
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