Ahead of UFC 203 in Cleveland, "UFC Countdown" explores the lives and training camps of six fighters as they prepare for fight night. Stipe Miocic looks to defend his title against Dutch kick boxer Alistair Overeem. Fabricio Werdum and Travis Browne meet in a rematch of their April 2014 tilt. And the debut of WWE superstar CM Punk is finally here. Watch UFC Countdown on FS1.