Leadville, Colorado is a mecca for endurance racing in the United States and home to some of the country's hardest trails and toughest athletes. In the summer of 2019, ultra runners Marvin Sandoval and Buttercup became unlikely partners and show us what happens when you combine a love of sport, hard work, a 10 foot lead rope, and a dash of crazy. One thing Marvin learned, "hang on and see what happens."