Question: Name the retired American gymnast who won gold in the 1984 Summer Olympics and who hosted a series of short American television segments called ABC Funfit aimed at promoting children's physical fitness?
Context: Alicia Marie Quinn (née Sacramone) ( ; born December 3, 1987) is a retired American artistic gymnast.  She won a silver medal with the United States team at the 2008 Summer Olympics and is the second-most decorated American gymnast in World Championship history, with ten medals. Len Saunders is a physical education teacher and childhood physical fitness advocate.  He is known for creating Project ACES, a day in which children around the world exercise simultaneously on the first day of May.  He created a new program called PACES Day, which motivates parents and children to exercise together over the weekends.  In 2009, Len created a new program called Exercise US (United States), which motivated children in the United States to exercise for 10 continuous hours, starting on the east coast of the US, ending 10 hours later on the west coast.  Saunders is also the author of 7 books, all on the topic of children's health and fitness.  His most recent book came out in February 2017 called "I Can Do That".  Saunders currently works as a P.E. teacher at Valley View Elementary School in Montville, New Jersey.  Valley View was the first school to participate in Project ACES].  Day and continues to participate every year.  He served as a consultant to The President's Council On Physical Fitness & Sports.  Most recently, he became an American Heart Association expert spokesperson on the issue of childhood obesity and childhood fitness. Roland Brückner (born 14 December 1955) is a retired German gymnast.  He competed at the 1976 and 1980 Summer Olympics in all artistic gymnastics events and won a bronze and a silver medal in the team competition, respectively.  Individually he won a gold in the floor exercise and two bronze medals in the vault and parallel bars in 1980.  He won two more gold medals in the floor exercise at the 1979 World Artistic Gymnastics Championships and 1981 European championships.  He missed the 1984 Summer Olympics due to their boycott by East Germany and competed at the Friendship Games instead, winning a gold on the floor and a silver in the team competition. Jacob "Jake" Dalton (born August 19, 1991) is a retired American gymnast and member of the University of Oklahoma Gymnastics and the U.S. National Team.  He grew up in Sparks, Nevada, the son of Tim and Denise Dalton.  He represented the United States at the 2012 Summer Olympics in London and in the 2016 Summer Olympics in Rio. Mary Lou Retton Kelley (born January 24, 1968) is a retired American gymnast.  At the 1984 Summer Olympics in Los Angeles, she won a gold medal in the individual all-around competition, as well as two silver medals and two bronze medals.  Her performance made her one of the most popular athletes in the United States. Scott Philip Johnson (born 12 July 1961) is an American retired artistic gymnast.  He represented the United States at the 1984 Summer Olympics and at the 1988 Summer Olympics.  He was a member of the 1984 gold medal winning team, and he was the team captain in 1988.  He made history at the 1987 Pan American Games by becoming the first gymnast to win a medal on each event. Paul Elbert Hamm (born September 24, 1982 in Washburn, Wisconsin) is a retired American artistic gymnast.  He is a World Champion gymnast and three-time Olympic medalist.  He is the 2003 World all-around champion, and he won the all-around competition at the 2004 Olympic Games.  He is the most successful American male gymnast, and the only male American gymnast to win all-around at World's and the Olympics. Peter Glen Vidmar (born June 3, 1961) is an American gymnast and Olympic medalist.  He won gold medals in the men's all-around team competition and the pommel horse competition, as well as a silver medal in the men's all-around individual gymnastics competition at the 1984 Summer Olympic Games in Los Angeles.  He was born in Los Angeles.  He was inducted into the U.S. Olympic Hall of Fame.  He has a total of three Olympic medals: two golds and a silver.  Peter is one of only three athletes inducted into the U.S. Olympic Hall of Fame twice: first as an individual, then as a member of the historic 1984 U.S. men's gymnastics team.  He also was the highest-scoring American gymnast in Olympic history. ABC Funfit is a series of short American television segments that were broadcast in 1985 and aired twice a day during ABC's Saturday morning cartoon programs.  The segments were five minutes long and presented exercises and information to promote children's physical fitness.  Olympic gold medalist Mary Lou Retton hosted the series, assisted by the "Funfit Kids" (Ericka Pazcoquin, Bradley Kane, Melissa Kern and Efrain Bracero).  The show was choreographed by Lynne Taylor-Corbett.  The album "ABC Funfit featuring Mary Lou Retton" was released in 1985. Peter Kormann (born 21 June 1955) is a retired American gymnast and gymnastics coach.  In the 1976 Olympics, he became the first American to medal in competition against the Soviets when he won a bronze medal in the men's floor competition.  Kormann's bronze medal was also the first Olympic medal of any type won by an American gymnast in 44 years.
Answer: Mary Lou Retton