United Kingdom, June 6 -- Simone Biles "almost died" this week.

The Olympic gymnast suffered a mystery health scare a few days ago and admitted it was one of the "scariest experiences" of her life, though she declined to share details of what happened to her.

Sharing a photo of her arm, in which she could be seen wearing multiple hospital bracelets, she wrote on her Instagram Story: "I'm not one to normally share things like this because I value privacy in today's age, but almost dying wasn't on my bingo card this week.

"This was one of, if not the, scariest experience of my life."

The 29-year-old star found the week particularly tough because her husband Jonathan Owens was away with the Indianapolis Colts training for the NFL preseas...