The first 100-kilometer race with International Association of Ultrarunners (IAU) championships status took place in 1987 in Belgium, marking the beginning of recognized ultra-distance events.
The 100k and 50k distances are recognized as valid records by World Athletics, specifically for road races, as measuring trail courses accurately poses significant challenges.
Pioneers like Ann Trason and Don Ritchie brought ultra-distance running to wider audiences, gaining credibility for the sport with their record-breaking performances and contributions.
In its early years, the IAU 100k World Championships featured an open race, with the inaugural 1987 event in Belgium recording 271 finishers from various countries.
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