Josh Levin, ‘American Ninja Warrior’: The Photos You Need to See

22-year-old Josh Levin hasn't raced like a rookie. In fact, he appears to be quite the seasoned ninja. Last week, Levin became the first finisher on stage 1 of American Ninja Warrior. As a former NASA intern, physics may be his passion-- but he may have to add American Ninja Warrior to that list. Click through our gallery to check out some of his best Instagram photos. (Instagram/JoshLevin)