Ultimate Ninja Challenge

Enduring extreme hardships is integral to practicing the ancient Japanese art of the ninja. Nine individuals take part in a 24-day survival challenge to find out who has what it takes to consider themselves a true-blue ninja. The challenge includes eight grueling missions -- trekking through a frigid swamp, surviving overnight on an icy glacier, crossing a raging river, escaping imprisonment, and more -- created by Jinichi Kawakami, Japan's last ninja grandmaster, which push the wannabe warrior…