Laurens "Larry" V. Griswold (September 17, 1905 – August 24, 1996), known as "The Diving Fool", was an American gymnast and entertainer who was involved in the early development of the trampoline.
Griswold was a college level gymnast and tumbler while studying physical education at the University of Iowa.
He also developed an act in the swimming pool which involved Griswold clowning and performing tricks on the diving board.
In 1945, he found that he had to limit his immersion in water for health reasons and so changed his routine to use a trampoline disguised as a swimming pool in his diving act.
In the 1950s and 1960s, he took his physical clowning & acrobatic act all across the United States becoming one of the top draws in show business.