The fastest race times are achieved at 35–45 years for both women and men.

Generally, women compete slower than men in ultramarathon running however, women were able to reduce the sex gap in recent years. Apart from anthropometric characteristics such as body mass index and body as well as training characteristics such as volume and speed during running training, previous experience is the most important predictor variable for successful ultramarathon performance. Ultramarathoners are different to marathoners regarding anthropometry and training where ultramarathoners complete more running kilometers in training than marathoners do, but they run more slowly during training than marathoners. Ultramarathoners were generally men, have a mean age of ~45 years, are married, and are well educated where percentage of female finishers is at ~20 %.

The longest ultramarathons cover several thousands of kilometers and can endure for up to two months. Ultramarathons can be held as single stage races in distance- and time-limited races and as multistage races. An ultra-endurance performance is defined as any performance lasting for longer than six hours.

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