Physiologists used to speak of the greater concentration of so-called fast-twitch muscle fibers in black athletes when compared with athletes of other races. I'm not sure whether that's been discredited, but if it hasn't, then I suppose these fibers would be not just in the legs but in the arms as well--so they'd be quick in the w'chairs.
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Self-deception facilitates harm to others and to oneself, undermines autonomy, corrupts conscience, violates authenticity, and manifests a vicious lack of courage and self-control that undermines the capacity for compassionate action.