I can’t believe people run marathons. Running 10 miles without stopping seems too hard. Running 26? How?

So quite frankly, I try to not even think about the concept of ultramarathons, where athletes run 100 miles or more, often over the course of several days. NO NO NO NO STOP! It’s fine! You don’t need to do that why are you doing that! But for some reason, people keep running ungodly distances, sometimes accomplishing feats so remarkable that I need to write about them.

One of those feats came in last week’s Cocodona 250, an ultramarathon held in the mountains of Northern Arizona. Rachel Entrekin finished the 253-mile course in 57 hours and nine minutes, beating all racers of all genders and resetting the course record by more than two-and-a-half hours.

• Entrekin averaged 5.3 mph, which doesn’t sound that fast … but of course, she did it FOR FIFTY SEVEN HOURS on a course with 40,000 FEET OF ELEVATION.

• One way Entrekin finished so quickly? She simply kept going. Entrekin only stopped for four hours and 40 minutes during her 57-hour race, meaning she was running more than 90 percent of the time, the most of any of the major contenders.

• Entrekin says she got 19 minutes of sleep over the course of three days at various aid stations. That’s nuts. I don’t know how you keep performing at a high level on that little sleep.

• Perhaps even more nuts: After finishing the race, she took rested just seven hours before heading back to the race to cheer her fellow runners. I’d be out for days! (Also kind of a flex to finish so far ahead of the field that you can sleep and then watch them finish.)