You might think that Olympic athletes are the healthiest people in the world. It's true that many are. However, it's also true that many Olympic athletes had to overcome  illnesses early in their lives. One excellent example is Wilma Rudolph. She competed in track-and-field events in the 1960 Olympics. She didn't win just one gold. She won three. At the time, people called her "the fastest woman in the world." As a young child, Wilma could not take part in sports. She had a series of serious illnesses, and then, at the age of 4, she got _ . She lost the use of her left leg, and the doctor said she would never walk again. The people in Wilma's family did everything they could to help her walk again. Wilma and her mother often traveled 100 miles to get treatments for her leg. Her brothers and sisters took turns giving her leg a daily massage. Four times a day, they helped her do special exercises for her leg. Amazingly, by the time Wilma was 9 years old, she was able to walk again. Before long, she started playing basketball and running. In high school, she was a track star and then she went to the Olympics. Wilma stopped being a runner when she was 22 years old. She then became a teacher and track coach. Her story encouraged many people to work hard and to overcome difficulties. What's the main idea of the passage?
Wilma Rudolph's family helped her overcome polio. Wilma Rudolph was seriously sick when she was a young girl. Wilma Rudolph was a great Olympic athlete, coach and teacher. Wilma Rudolph overcame many difficulties to become a great athlete.