Track-and-field superstar Carl Lewis says that at age 29, he overhauled his eating habits and began following a vegetarian, sometimes vegan, diet. Then, at age 30, he ran his personal best. What does he do today to stay slim? Find out now.

In 2008, powerhouse gymnast Shawn Johnson took home four medals from the Olympic Games, including one gold and three silver. But, even on her best days, Shawn says, she struggled with the constant pressure to be thinner. Watch as this 20-year-old opens up about her body image issues.

Famed Olympian Mark Spitz says that when he was 9 years old, his mother enrolled him in a YMCA summer camp. Watch as Mark tells Oprah how an aversion to arts and crafts led him to the club's heated pool and his very first swim team.

Husband-and-wife team Bart Conner and Nadia Comaneci, both gold medal gymnasts, also share a commitment to the Special Olympics. Watch as Bart reveals how the Special Olympics transforms lives around the world.

Track-and-field star Carl Lewis, one of the most decorated Olympians in history, won nine gold medals and one silver medal during his career. However, Carl's achievements were often overshadowed by his reputation as arrogant.

For 36 years, Mark Spitz, a swimmer who won seven gold medals in 1972, held the record for the most gold medals in a single Olympic Games. Then, in 2008, Michael Phelps broke his record. Would Mark ever swim against Michael? Find out now.

During the opening ceremony of the 1996 Summer Olympics in Atlanta, Janet Evans, a swimmer who won three gold medals in 1988, was chosen to pass the Olympic torch to boxing legend Muhammad Ali. Janet tells Oprah how this helped her overcome a tough defeat and taught her how to be a true champion.

As a five-time Olympic champion, Greg Louganis is considered by many to be the greatest diver of all time, but the road to glory wasn't easy. Greg tells Oprah how he got to the other side of being a victim.

Some people are born wealthy. Some are blessed with good looks. But, as gold medal gymnast Bart Conner says, Olympic athletes don't get to the top of the podium because of family connections or dumb luck. Watch as Bart describes what it takes to achieve victory.

At the 1984 Los Angeles Olympic Games, 16-year-old Mary Lou Retton became the first American woman to take home the gold in gymnastics. Now, Mary Lou looks back on what she calls "the time of her life."