Top finishers from the preliminary rounds take on a challenging obstacle course to compete for the chance to move onto the finals round in Las Vegas and the chance to win $500,000. Competitors range from trained athletes to everyday Americans including schoolteachers, police officers, moms and even granddads.

Comedian Matt Iseman hosts the heart-racing obstacle course competition series "American Ninja Warrior." Top finishers from the preliminary rounds take on a challenging obstacle course to compete for the chance to move onto the finals round in Las Vegas and the chance to win $500,000. Competitors range from trained athletes to everyday Americans including schoolteachers, police officers, moms and even granddads.