It's one thing to run five or 10 miles in the cool of the early morning before the summertime heat turns the desert floor into a broiler. But what about running a marathon at midday when the thermometer tops out around 110 degrees?

That's what a group of hardy athletes will do when they gather at Lake Mead National Recreation Area Saturday (start and finish at Boulder Beach) for the Running with the Devil event. Participants will compete in five distance options: 50 miles (roughly a double marathon), marathon (26.2 miles), half-marathon, 10K and 5K.