YUMA — Students from Yuma Elementary lined both sides of the entrance to the school while eagerly holding posters and watching every passing car. They let out a scream, which turned into a dull roar, when they finally saw him. The Ginja Ninja was in town and every single student was excited to give him a high-five as he made his way into the school. Chris Boehm, who made it to the finals on season 8 of the television show “American Ninja Warrior,” was at the school to help teach students about fitness.