I remember Rafael Marquez trained at high altitude when preparing to fight Manny Pacquiao. I'm still not sold on the idea of short-term altitude training, but I wonder how high a red cell count many Mexican fighters have.

Do know if Julio Cesar Chavez trained/lived at such an altitude. He had stamina on par with Marvin Hagler, but I wonder if his red cell count was higher. I don't know it'd make a difference though.