Gymnast Simone Biles cheers on her teammates at the Tokyo Olympics. (Credit: NBC)

One of the leading doctors for the U.S. Olympic team says star gymnast Simone Biles was right to withdraw from competition after a bout of what gymnasts call the “twisties.” Dr. Mark Hutchinson joins us from Tokyo to share his impressions of the Games so far.

Coach Laurent Landi embraces Simone Biles, after she exited the team final with apparent injury, at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo / Gregory Bull)

The 2016 Olympic gymnastics champion will return to competition in the balance beam final on Tuesday, a little over a week after stepping away from the meet to focus on her mental health.

Sunisa Lee, of the United States, finishes on the uneven bars during the artistic gymnastics women’s all-around final at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo. (AP Photo / Ashley Landis)

An American finished atop the podium in the women’s Olympic gymnastics all-around, just like always. Sunisa Lee became the fifth straight American woman to claim the Olympic title on Thursday while defending champion Simone Biles watched from the stands.

Simone Biles, of the United States, watches gymnasts perform after an apparent injury, at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. Biles withdrew from the team finals. (AP Photo / Ashley Landis)

By pulling on her white sweatsuit in the middle of Tuesday night’s Olympic gymnastics meet, and by doing it with a gold medal hanging in the balance, Simone Biles might very well have redefined the mental health discussion that’s been coursing through sports for the past year.

Simone Biles, of the United States, waits to perform on the vault during the artistic gymnastics women’s final at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. The American gymnastics superstar has withdrawn the all-around competition to focus on her mental well-being. (AP Photo / Gregory Bull)

Simone Biles will not defend her Olympic title. The American gymnastics superstar withdrew from Thursday’s all-around competition to focus on her mental well-being.

Simone Biles, of the United States, watches gymnasts perform after an apparent injury, at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. Biles withdrew from the team finals. (AP Photo / Ashley Landis)

Simone Biles came to Tokyo as the star of the U.S. Olympic movement and perhaps the Games themselves. It all came to a stunning halt in the women’s gymnastics final on Tuesday night with an uncertain vault.

In this Aug. 9, 2016, file photo, U.S. gymnasts and gold medallists, Simone Biles, left and Gabrielle Douglas celebrate on the podium during the medal ceremony for the artistic gymnastics women's team at the 2016 Summer Olympics in Rio de Janeiro, Brazil. (AP Photo / Julio Cortez, File)

The face of gymnastics in the United States is changing. There are more athletes of color starting — and sticking — in a sport long dominated by white athletes at the highest levels.