the ability to get up off the floor and win vs a solid chin

both are important ingridients however some are born with a strong chin, and some are not so lucky but those that are not so fortunate, work with what they have. they breed their killer insinct. they learn from early on, that they might go down, but they have to get up and put that damn pressure on otherswise they are cooked ducks having a solid chin can be overated at times. guys can be hit but are not as bothered, and just cruise through the fight. guys with weaker chin seem to wake up after a good shot, and work miracles. after they go down, they face reality and know the consequence of not getting up. but there are few that get up though...