Marge Hickman can't sit still. If she's not running, she's hiking, driving around the country in her RV, or engaging in another form of movement. Since she was a kid, the ultra running phenom has always felt an insatiable drive to prove herself. And that drive has taken her places few in the running community have dared to go. In 1989, Hickman completed the grand slam of ultra running, meaning she finished four of the oldest 100-mile races in a span of 10 weeks. She is one of only 59 women who have accomplished the feat since it was established in 1986. She also completed the Leadville Trail 100 a total of 14 times (within the time limit), the most by any woman at the event. Now, at almost 75 years old, Hickman still competes regularly as an enduring pioneer in the sport.