Info: https://en.wikipedia.org/wiki/Man_versus_Horse_Marathon

Takes place in Wales every June. Despite the name it is not a full marathon, and is usually 22mi/35km long. The first time a human won the race on foot was in 2004. Humans won in both 2022 and 2023, but only four times total since 1980. Humans have an advantage if the temperature is hot that day, but horses benefit if the route is especially hilly.