People from the Southwest compete for a chance at the world's most difficult obstacle course.

Athletes who completed the southwest-region preliminary round take on a more-challenging course in their bid to qualify for the national finals in Las Vegas.

The top 30 finishers from the Southwest qualifying round take on an even more challenging obstacle course to advance to the national finals.

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

Conclusion. The Midwest regional qualifying round challenges the athletes.

Athletes who completed the Midwest-region preliminary round take on a more-challenging course in their bid to qualify for the national finals in Las Vegas.

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

Conclusion. The Northeast regional qualifying round challenges the athletes.

Athletes who completed the Northeast region preliminary round take on a more challenging course in their bid to qualify for the national finals in Las Vegas.

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

Conclusion. The Northwest regional qualifying round challenges the athletes.

Athletes who completed the Northwest region preliminary round take on a more challenging course in their bid to qualify for the national finals in Las Vegas.

Part 1 of 2. The mid-South regional qualifying round challenges the athletes.

Conclusion. The mid-South regional qualifying round challenges the athletes.

Athletes who completed the mid-South region preliminary round take on a more challenging course in their bid to qualify for the national finals in Las Vegas.

Athletes and everyday people compete for a chance to take on the World's Most Difficult Obstacle Course.

Athletes and everyday people compete for a chance to take on the World's Most Difficult Obstacle Course.

Athletes who completed the Southeast region preliminary round take on a more challenging course in their bid to qualify for the national finals in Las Vegas.

One hundred competitors attempt the most-difficult obstacle course.

Part 2 of 6. One hundred athletes face Stage 1 in Las Vegas.

Part 3 of 6. One hundred athletes face Stage 1 in Las Vegas.

Athletes who completed the Midwest region preliminary round take on a more-challenging course in their bid to qualify for the national finals in Las Vegas.

Part 5 of 6. Athletes compete in the finals in Las Vegas.

Ultimate challenges including the Spider Flip and the Double Salmon Ladder.

Previously unseen footage includes top finishers from preliminary rounds tackling a challenging obstacle course.

Competitors face a challenging obstacle course in hope of landing a spot in the finals.

Top contenders tackle a challenging obstacle course in hope of moving to the final round.

Competitors face a challenging obstacle course in hope of landing a spot in the finals.

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Top finishers from the regionals advance to the final round.