Akbar Gbajabiamila is host of NBC’s three-time Emmy Award-nominated hit competition series “American Ninja Warrior,” which begins its 11th season this summer. He is also host of “American Ninja Warrior Junior” on Universal Kids.

Gbajabiamila, who played five years in the NFL with the Raiders, Chargers and Dolphins, also host’s NFL Network’s “NFL Fantasy Live” and his inspiring new book, “Everyone Can Be a Ninja: Find Your Inner Warrior and Achieve Your Dreams” (Gallery Books), hits shelves in May. His first book draws inspiration from the fierce competitors on “American Ninja Warrior...