Josh Kronberg and Arnold Risvik are the co-owners of NinjaForce in Albuquerque, New Mexico.  Josh and Arnold are two of the most creative and talented obstacles builders in the business.  There are few gyms like NinjaForce in the world- everything is custom built out of metal. Most of the obstacles are almost exact replicas of obstacles on the show; others are original pieces that you won't see anywhere else. In this episode, they talk about how they build, why they choose to build what they do, and what it's like to compete at the highest levels of American Ninja Warrior.