Floyd Mayweather usually come out of the fight pretty much without any sort of punishment and that down to his cat like reflexes and ability to avoid punches. He usually start training about 3 months before the fight and it starts of with casual workouts and sparring sessions before slowly getting into intense workouts and more sparring rounds. All that has to be done keeping his weight in the limit. His personal chef describe his diet has organic fruits/vegetables with loads of protein in-take.