The first possible reason is biology. Crossfit emphasizes high intensity workouts, muscle confusion and complex movements with little rest that push the body to its limits. This can be taken too far and lead to a condition known as “rhabdomyolysis,” in which damaged skeletal muscle tissue can be released into the bloodstream and lead to kidney failure. Crossfitters humorously refer to the phenomenon as “Uncle Rhabado,” a name which will go down in bigotry next to Uncle Tom.
However, Crossfit's “implictly white” nature is not just the fault of whites. Blacks' own behavior has a lot to do with it. Blacks have a love-hate relationship with fitness. Sports is one of the ways Black Run America can produce positive black role models (with the others being entertainment and politicians assuming they are Democrats). Athletic accomplishment is highly prized, far more than academics. Thus, many black males enjoy putting on muscle and showing it off, especially rappers who like to perform shirtless like 50 Cent, LL Cool J, and DMX. On the other hand, though the media enjoys promoting images of “fat white males,” obesity is actually far more prominent among blacks.