After Motridge's swimming and film career, she was involved in philanthropic efforts with her husband, including a Boys & Girls Clubs of San Dieguito Foundation scholarship.

Motridge was born in San Francisco on July 30, 1913,[4] later attending Hollywood High School and the University of Southern California.

[1] At the 1936 Summer Olympics, Motridge placed fourth in the women's 100-meter backstroke with a time of 1:19.6.

[a] After her competitive swimming career, Motridge worked on movies at Metro-Goldwyn-Mayer (MGM) as Esther Williams' stunt double and stand-in.

[1] Throughout their partnership they were involved in philanthropic efforts,[1] including a Boys & Girls Clubs of San Dieguito Foundation scholarship[19] started in the late 1980s[20] which was reported in 1999 to give $25,000–$30,000 scholarships to students in North County, California.