Just because a fighter is of mexican heritage doesnt mean they have balls of steels.. u either got heart or you dont doesn't matter what nationality you are
I think Mongolians are especially tough. They ride hundreds of miles on horseback in very inclement weather.
They deal with a very harsh environment and live off the land.
I think you have to be Mongolian to understand.
Marcos "El Chino" Maidana has heart.. and apparently he's part Japanese!...: http://www.boxingscene.com/forums/showthread.php?t=284438