No doubt there have been tall and heavy Asians. Sumo wrestling is witness to that. But the exceptions prove the general rule. In those cases it is not racial prejudice but specific skills and abilities which translate in earning big money. In fact there was a famous Chinese center Yao Ming among a few other Chinese basketballers who played for American teams. The average height of men in So. Sudan is 6'4" but that is a local phenomenon . However this is offset by the average height of all African men.