One of the highlights of Biles' illustrious career is her signature move, the Yurchenko double pike (now called the Biles II), a move so difficult and dangerous that it has redefined the sport.

The Biles II was out on floor. So, too, her double twisting, double somersault dismount on uneven bars. She did the Yurchenko double pike vault (yes, also named the Biles II), but Laurent Landi ...

On vault, Biles pulled off a flawless Yurchenko double pike, or Biles II—two flips with her legs perpendicular to her body, giving her no margin for error—drawing gasps from the crowd of ...