Simone Biles’s gold-medal-winning Yurchenko double pike, frame by frame.

Credit...Gabriela Bhaskar for The New York TimesSimone Biles won the gold medal in the vault with her signature Yurchenko double pike and then a vault called a Cheng. The Yurchenko double pike is the hardest vault in women’s gymnastics: She does a roundoff onto the springboard, a back handspring onto the vaulting table, then catapults herself into a double back flip with her legs straight in front of her.

Credit...Gabriela Bhaskar for The New York Times Credit...Gabriela Bhaskar for The New York TimesCredit...Gabriela Bhaskar for The New York TimesCredit...Gabriela Bhaskar for The New York Times Credit...Gabriela Bhaskar for The New York TimesCredit...Gabriela Bhaskar for The New York Times…