Get ready to tackle this mud-filled 5K in Oak Harbor, OH, complete with over 20 obstacles designed in both "challenge" and "Xtreme" versions so runners of every ability can find their perfect difficulty level. You'll score a medal, t-shirt, and wristband just for participating, plus early registrants in the first four waves have the awesome option to run the course twice for only $5 more—and if you're competitive, timed heats are available for age-group recognition. Plus, you'll enjoy giveaways and raffles throughout the event, knowing that 10% of all proceeds support Ronald McDonald House Charities.