In the old days we fed the BMW system, Beans, Maize and Wheat. They did well at the distance but believe me they didn't return in the superior condition that they do nowadays. Using the more scientific mixtures and feeding methods DEFINATELY helps at the extreme distances although their will be plenty of pigeons to contradict this theory. Roger Bannister beat the 4 minute mile and fell over the line. Look at the athletes nowadays, they run marathons and don't even break sweat. Must move with the times lads imo.