The heart-racing obstacle course competition series "American Ninja Warrior" premieres for its eighth season this summer. The action-packed series follows competitors as they tackle the world's most difficult obstacle courses in qualifying and finals rounds across the country. Those that successfully complete…- The Season 7 premiere opened with a qualifying round for Venice Beach, California participants. Obstacles included the Mini Silk Slider, Spin Cycle, and Hourglass Drop. Contestants included Jackson Meyer, Kevin Bull, David Campbell, former Baltimore Raven Brendon Ayanbadejo and Seattle Seahawk Jon Ryan.