Well, unlike bull-running, there's no risk to animals. But it does, as another winner said, basically entail being an idiot:
A woman was knocked unconscious while running down a hill to chase a 3kg (7lb) cheese wheel, but still managed to win her race at the bank holiday event.
Video footage posted on social media showed Delaney Irving falling while pursuing the double gloucester down the almost-vertical Coopers Hill in Brockworth, near Gloucester.
Irving, 19, said she only realised she had won the women’s race when she woke up in the medical tent.
...
Irving, from Vancouver Island in Canada, told the BBC she was not cheesed off by what had happened, and said the race was “good … now that I remember it”.
https://www.theguardian.com/food/2023/may/29/woman-wins-coopers-hill-cheese-rolling-race-despite-being-knocked-out