Riley Gaines broke down the personal attack Simone Biles levied on her on social media and what it really meant for the Olympic gold medalist and one of the greatest gymnasts of all-time.

Biles criticized Gaines for using her social media to target a trans teen athlete. Now, Gaines is apologizing for making it "personal."

Simone Biles and Riley Gaines exchanged a series of tense comments online over disagreements on transgender athletes. Here's everything to know about Simone Biles and Riley Gaines' feud.