An ultramarathon is usually on the order of 50 or 100 miles.
At 10,430 feet, Leadville is an extreme place to host a 100-mile ultramarathon.
In his five-year ultramarathon career he has won nine events, including the 50-mile Squaw Peak race.
Usually it involved feats of endurance which would now be classified as ultramarathon.
Sports featured include climbing, kayaking, sailing, windsurfing and kitesurfing, various forms of bicycle racing, and cross-country running, especially ultramarathon and multi-discipline events.
Many high profile trail races are of ultramarathon distance.
It is the world's largest and oldest ultramarathon race.
This multi-day event comprises ultramarathon, 24-hour race and a 48-hour race.
