Deseret News This 15-year-old Utahn and his dad just made history on ‘American Ninja Warrior’ Kai has been training for the show since he was 7, maneuvering through the 40-plus obstacle courses his dad engineered and built in their St. George backyard Share this story Elizabeth Morris, NBC At one point, as 15-year-old Kai Beckstrand was breezing through the “American Ninja Warrior” obstacle course that even professional athletes and longtime competitors on the show struggle to complete, an announcer shouted: “He’s making this course look like child’s play!” And for Kai, who has been training for the show since he was 7, maneuvering through the 40-plus obstacle courses his dad engineered and built in their St. George, Utah, backyard over the years, maybe it was.