As male transgender athletes continue to encroach further into women's sports, it's becoming even more important that female competitors refuse to take part. 

And that's exactly what's happening in a European pool tournament, with support from OutKick's Riley Gaines.

Kim O'Brien, a female athlete, recently forfeited her spot in the women's championship final rather than compete against a male billiards player, Harriet Haynes. Gaines, host of the Gaines for Girls podcast, posted about it on X, saying that she'll be paying the prize money that O'Brien lost out on as a result of refusing to compete against a transgender athlete. 

Gaines applauds O'Brien's decision and tells OutKick more about what motivated her to get involved.