Retired former Charger Shawne Merriman has found a new athletic outlet. “I can’t wait to compete on Season 5 of AmericanNinjaWarrior this summer,” he announced on Twitter. Merriman, alas, won't be wearing ninja attire (not enough fabric) or throwing sharp objects at people. Contestants run an obstacle course, and this one's more daunting than even the Cheating Belichicks or Marlon McCree with a football. In Ninja Warrior's original series, only three of 2,700 competitors met the challenge.