"Manners says that this enormous social pressure placed on your ability to endure pain is actually great training for a sport like running where "pushing throug

"Manners says that this enormous social pressure placed on your ability to endure pain is actually great training for a sport like running where "pushing through pain" is so fundamental to success." Given that this is tradition, and failures are labelled cowards, I wonder if this is actually evolution in action (rather than nurture)? Presumably the "cowards" are likely to have less reproductive success?