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The military's toughest training challenges have a lot in common with outdoor sufferfests like the Barkley Marathons and the Leadville Trail 100: you have to be fit and motivated to make the starting line, but your mind and spirit are what carry you to the end. A Ranger graduate breaks down an ordeal that shapes some of the nation's finest soldiers.

Indian relay racing is sometimes called America’s first extreme sport. For years, the Brew Crew—a team from the Pine Ridge Reservation in South Dakota—were a dominant force. Then tragedy struck. This is the story of the Lakota’s spiritual relationship with the horse, and a quest to regain glory on the track.