Seems like balance is the key.
Strength, fortitude, toughness, are virtues in the right context, if balanced with compassion and a strong set of ethics/values.
After all, "strong, unbreakable and impervious to pressure" are admirable qualities. Yet boys who only allow themselves to do "macho" activities and reject other activities in which they might otherwise be interested...are showing the opposite: weakness and susceptibility to peer pressure.