The sprinter Allyson Felix has competed in four Olympics, winning more medals in track and field — nine — than any other American woman. Should she make the team for next month’s Tokyo Games, which would almost surely be her last, and earn one more medal, it would make her the most decorated Olympian female track athlete from any country. As she has grown older, Felix, who is 35, has also earned increased attention for her work outside the arena. The difficult birth of her daughter, Camryn, in 2018 caused her to speak out for racial equality in maternal health care.