Become the next American Ninja Warrior: The Ultimate Guide on how to Prepare and Win the next American Ninja Warrior Obstacle Race
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How to train for "American Ninja Warrior" (revised 2018 version) Today only, get this Amazon book for just $6.99. Regularly priced at $9.99. In 15th-century Japan, ninjas had more to worry about than their bench press and body-mass index. They were too busy being awesome. Some 600 years later, exercise routines tend to put health before stealth - and with good reason, given today's obesity and heart disease rates. But they also increasingly value versatility, mixing sports to "cross-train" ...






















