10 U.S. gyms where you can try a 'Ninja Warrior' course


"The locales train future ninja warriors, and often cater to kids, who come for parties and training. But they also welcome drop-in visitors of all ages. "It’s a place for people who watch the show and say ‘I can do that’ to see if they really can," says Grant McCartney, a top competitor who promotes the sport around the world. He shares some favorite gyms."

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