File-This July 28, 2019, file photo shows United States gold medalist Simone Manuel posing with her medal following the women's 50m freestyle final at the World Swimming Championships in Gwangju, South Korea. Katie Ledecky is among several big names diving back in with three months to go until the U.S. Olympic trials. Caeleb Dressel, Manuel, double backstroke world-record holder Regan Smith, and Ryan Lochte will swim over four days in the first single-site American meet since the pandemic began. (AP Photo/Lee Jin-man)

File-This July 27, 2019, file photo shows the United States' Simone Manuel diving in for the final leg of the mixed 4x100m freestyle relay final at the World Swimming Championships in Gwangju, South Korea. Katie Ledecky is among several big names diving back in with three months to go until the U.S. Olympic trials. Caeleb Dressel, Manuel, double backstroke world-record holder Regan Smith, and Ryan Lochte will swim over four days in the first single-site American meet since the pandemic began. (AP Photo/Mark Schiefelbein, File)

File-This July 27, 2019, file photo shows United States' Katie Ledecky swimming in the women's 800m freestyle final at the World Swimming Championships in Gwangju, South Korea. Like everyone else, Ledecky was forced to shelve her plans when the coronavirus pandemic took hold. Instead of looking far into the future, the five-time Olympic champion swimmer switched to a more immediate mindset. Forget that the four-year cycle leading to the 2024 Paris Olympics is already underway. Ledecky is still working toward making a big splash at this summer's delayed Tokyo Games (AP Photo/Mark Schiefelbein, File)

File-This July 27, 2019, file photo shows gold medalist Katie Ledecky of the United States waving on the podium following the women's 800m freestyle final at the World Swimming Championships in Gwangju, South Korea. Like everyone else, Ledecky was forced to shelve her plans when the coronavirus pandemic took hold. Instead of looking far into the future, the five-time Olympic champion swimmer switched to a more immediate mindset. Forget that the four-year cycle leading to the 2024 Paris Olympics is already underway. Ledecky is still working toward making a big splash at this summer's delayed Tokyo Games. (AP Photo/Mark Schiefelbein)

File-This July 27, 2019, file photo shows gold medalist United States' Katie Ledecky posing with her medal following the women's 800m freestyle final at the World Swimming Championships in Gwangju, South Korea. Like everyone else, Ledecky was forced to shelve her plans when the coronavirus pandemic took hold. Instead of looking far into the future, the five-time Olympic champion swimmer switched to a more immediate mindset. Forget that the four-year cycle leading to the 2024 Paris Olympics is already underway. Ledecky is still working toward making a big splash at this summer's delayed Tokyo Games.(AP Photo/Lee Jin-man, File)

File-This July 27, 2019, file photo shows gold medalist United States' Caeleb Dressel posing with his gold medal following the men's 50m freestyle final at the World Swimming Championships in Gwangju, South Korea. Katie Ledecky is among several big names diving back in with three months to go until the U.S. Olympic trials. Dressel, Simone Manuel, double backstroke world-record holder Regan Smith, and Ryan Lochte will swim over four days in the first single-site American meet since the pandemic began. (AP Photo/Lee Jin-man, File)

File-This July 28, 2019, file photo shows the United States' Regan Smith starting the backstroke leg in the women's 4x100m medley relay final at the World Swimming Championships in Gwangju, South Korea. Katie Ledecky is among several big names diving back in with three months to go until the U.S. Olympic trials. Caeleb Dressel, Simone Manuel, double backstroke world-record holder Smith, and Ryan Lochte will swim over four days in the first single-site American meet since the pandemic began. (AP Photo/Mark Schiefelbein, File)

File-This July 27, 2019, file photo shows United States' Caeleb Dressel swimming in the men's 100m butterfly final at the World Swimming Championships in Gwangju, South Korea. Katie Ledecky is among several big names diving back in with three months to go until the U.S. Olympic trials. Dressel, Simone Manuel, double backstroke world-record holder Regan Smith, and Ryan Lochte will swim over four days in the first single-site American meet since the pandemic began. (AP Photo/Lee Jin-man, File)