Gut Check," a term commonly used in the military, means "We're going to test you and try to break you to find what you're truly made of!" Gut Check Fitness offers world-class Boot Camp Training for those willing to test their courage, determination and character. We also host elite events nationwide, including the King of the Hill Trail Running Series, The SUCK and Gut Check Challenge. Gut Check Fitness was voted World's best, toughest and most creative workouts. Get in the best shape of your life with tough, fun and energizing workouts — all with a built-in social network.Are an obstacle course racer, trail runner, ultra-marathoner, or just looking for a great workout? We are looking for like-minded people to join our community.