Ultramarathon runners train for months, sometimes years. But what happens when they don't finish a race?
DNF stands for 'did not finish' – the acronym no ultrarunner wants assigned to their race result. For amateurs, DNFing is loaded with emotion – but attrition rates are extremely common

TL;DR
- DNF stands for 'did not finish' and carries significant emotional weight for amateur ultrarunners.
- Attrition rates in ultramarathons are common, ranging from 15% to 40% depending on race conditions.
- Reasons for DNFs can be physical (injury, dehydration, illness) or psychological (diminished motivation, emotional exhaustion).
- Elite athletes also DNF, and their decisions are often viewed as wise, prioritizing long-term health over pushing through severe pain.
- The article emphasizes that a DNF is part of the journey and not necessarily a failure, encouraging a focus on the training and experience.