This week, in conjunction with the World's Toughest Mudder season-ending competition, Tough Mudder unveiled its new obstacles and special features for previous event participants for 2017. Some of the new obstacles—which join other classics such as the 10-foot-high walls, fire walk and muddy pools—will debut on Saturday Nov. 12 at World’s Toughest Mudder, u200bthe 24-hour extreme endurance race. Others won't be seen until the season starts up again in spring 2017, but that doesn't mean you can't start preparing for your next mud-run obstacle race now. Below are some of the highlights to Tough Mudder's additions for the new year.