At 9 a.m. on a Wednesday in January, Simone Biles was dancing in the middle of World Champions Centre in Spring, Texas, but no music was playing. Clad in black spandex shorts and a hoodie — all Nike, her corporate sponsor — the three-time world gymnastics champion was going through the motions of her new floor routine, while Dominic Zito, the national team choreographer, stood on the sidelines watching her as she sashayed across the mat. Zito hit play on his laptop, and Brazilian music blared from speakers.