Athletes across the Southwest get their first chance to take on the World's Most Difficult Obstacle Course.

Athletes across the Southwest compete for a chance to take on the World's Most Difficult Obstacle Course.

The top 30 finishers from the Southwest region preliminary round compete to move into the finals

Part 1 of 2. The Midwest regional qualifying round challenges the athletes.

Athletes across the Midwest continue to vie for a chance to take on the World's Most Difficult Obstacle Course. Only 30 will move on to the Midwest regional finals--and this time, there's a brand new obstacle involving hanging curtains.

Athletes across the Northeast continue to compete for a chance to take on the World's Most Difficult Obstacle Course. Only 30 will move on to the Northeast regional finals; so far only eight have defeated all of the obstacles in Miami.

The top 30 finishers from the Northeast region preliminary round take on an even more challenging course to lock a spot in the Vegas finals. Athletes must face three new Miami obstacles: the bungee bridge, jumping bars and the wall lift.

Aspiring ninjas across the Northwest continue to compete for a chance to tackle the World's Most Difficult Obstacle Course. Only 30 will move on to the Northwest regional finals. See who is strong enough to beat out their competition.

The search continues in Venice Beach as the top thirty from the Northwest preliminary round are narrowed down to fifteen. Athletes tackle eight obstacles and a 45-foot cargo climb to earn a trip to Las Vegas for the national finals.

Athletes from the Midsouth compete for a chance to take on the World's Most Difficult Obstacle Course. Only 30 will move on to the Midsouth regional finals--and this time, there's a punishing new obstacle called the rope junction.

Athletes from across the country meet in Las Vegas to compete in the second half of stage one of the National Finals.

Athletes across the Southeast congregate in Miami, Florida to compete for a chance to take on the World's Most Difficult Obstacle Course. Only 30 will move on to the Southeast regional finals.

Athletes across the Southeast congregate in Miami, Florida to compete for a chance to take on the World's Most Difficult Obstacle Course. Only 30 will move on to the Southeast regional finals.

Athletes across the Southeast continue to compete to take on the World's Most Difficult Obstacle Course.

The top 30 finishers from the Southeast region preliminary round compete for a spot in the finals.

85 athletes take on 23 obstacles on 4 stages in Las Vegas' Mount Midoriyama for a chance to be the first American Ninja Warrior.

Athletes from across the country meet in Las Vegas to compete in the second half of stage one of the National Finals.

The finals continue as competitors take on the challenge of Stage 1 of the World's Most Difficult Obstacle Course.

Competitors continue to take on Stage 1 of the punishing obstacle course in Las Vegas.

As Stage 1 comes to a close, eighteen challengers attempt to clear eight grueling obstacles including the Step Slider, Giant Swing and the Spinning Bridge.

Top finishers tackle the four stage obstacle course modeled after the famed Mount Midoriyama in Japan.

Athletes face the eight obstacles of Stage 1 in Las Vegas.

Part 4 of 6. Athletes face the eight obstacles of Stage 1 in Las Vegas.

Finalists take on a four-stage course. Challenges include a "jumping spider" and a "spinning bridge."

Athletes compete in the finals in Las Vegas.