In 1984, Mary Lou Retton became the first US gymnast to win the individual all-around gold medal at the Olympic Games. Almost 40 years later, Sunisa Lee won all-around gold at the Olympics in Tokyo, Japan. Explore the careers of two great US athletes and choose your favorite!

K.C. Kelley has written dozens of books for young readers, mostly about sports. He has also written about robots, astronauts, creatures that creep in the dark, and other things that kids love. He lives in Santa Barbara, California.