Olympic cyclists enjoy natural COVID-19 bubble outside Tokyo
A worker runs across the BMX racing track as preparations continue for the 2020 Summer Olympics, Tuesday, July 20, 2021, at the Ariake Urban Sports Park in Tokyo. (AP Photo/Charlie Riedel)

A worker runs across the BMX racing track as preparations continue for the 2020 Summer Olympics, Tuesday, July 20, 2021, at the Ariake Urban Sports Park in Tokyo. (AP Photo/Charlie Riedel)

Jul. 20, 2021 12:51 AM EDT
A worker paints Olympic rings at the finish line of the BMX racing track as preparations continue for the 2020 Summer Olympics, Tuesday, July 20, 2021, at the Ariake Urban Sports Park in Tokyo. (AP Photo/Charlie Riedel)

A worker paints Olympic rings at the finish line of the BMX racing track as preparations continue for the 2020 Summer Olympics, Tuesday, July 20, 2021, at the Ariake Urban Sports Park in Tokyo. (AP Photo/Charlie Riedel)

Jul. 20, 2021 01:07 AM EDT
A train passes in the distance beyond the finish line of the BMX racing track as preparations continue for the 2020 Summer Olympics, Tuesday, July 20, 2021, at the Ariake Urban Sports Park in Tokyo. (AP Photo/Charlie Riedel)

A train passes in the distance beyond the finish line of the BMX racing track as preparations continue for the 2020 Summer Olympics, Tuesday, July 20, 2021, at the Ariake Urban Sports Park in Tokyo. (AP Photo/Charlie Riedel)

Jul. 20, 2021 12:54 AM EDT
The BMX racing track is seen from the top of the grandstands as preparations continue for the 2020 Summer Olympics, Tuesday, July 20, 2021, at the Ariake Urban Sports Park in Tokyo. The pandemic-delayed games open on July 23 without spectators at most venues. (AP Photo/Charlie Riedel)

The BMX racing track is seen from the top of the grandstands as preparations continue for the 2020 Summer Olympics, Tuesday, July 20, 2021, at the Ariake Urban Sports Park in Tokyo. The pandemic-delayed games open on July 23 without spectators at most venues. (AP Photo/Charlie Riedel)

Jul. 20, 2021 01:09 AM EDT