Eco Fun Challenge, LLC, Irwindale

Irvine Lake Mud Run leads racers along a perfectly filthy 5K path beginning and ending at picturesque Irvine Lake. As runners sprint along mud-laden roads, they're forced to conquer obstacles such as dirt mounds, tires, jump walls, and mud pits. After crossing the finish line, they can cleanse themselves in one of the 30 onsite showers or with one long, dog-like shudder. Next they can swill sips of craft brews in the beer garden, groove along to live music, or peruse the booths during the Action Sports & Eco Fair.