Mental & physical toughness is a huge part of being an MMA fighter, it allows the fighter to push hard when the fight gets tough, the ability to take a punch determines where the fight will go, some fighters aren’t able to take the impact of a clean punch where the body is forced to shut down, but there are other fighters who able to withstand the damage & are known to have strong chins where they will keep pushing forward no matter what happens in their fights.
See the full video from MMA Release: