Secrets of How to Be an American Ninja Warrior

YH goes behind the scenes at NBC's "American Ninja Warrior" to check out the new course and catch up with the athletes themselves as they prep for battle, including Jessie Graff, David "Flip" Rodriguez, Kevin DeBruin, Stephen Seiver, and Tiana Webberley, as well as hosts Matt Iseman and Akbar Gbaja-Biamila! Find out how the competitors adjust to new challenges and how they stay motivated to keep going even if they fail the course!