Margaret B. Lettvin is an American writer and promoter of exercise and health. She was known in the Boston area in the 1970s for a television show called Maggie and The Beautiful Machine, and a book based on the show. After a serious car accident, she developed a set of exercises for back pain, which became Maggie's Back Book (ISBN 0395251478).
She is the widow of MIT professor Jerry Lettvin.
- John Underwood (May 26, 1975). "Beating Their Brains Out". Sports Illustrated. Retrieved 24 May 2011. "In the wrestling and fencing rooms, faculty and students submitted themselves to Maggie Lettvin for overhauls. Maggie is svelte, black-haired and 48, "The Beautiful Machine" of Boston educational television. Her roly-poly husband is an MIT biology and electrical engineering professor."
- "WGBH Program list — to 2000". WGBHalumni.org. Retrieved 2011-05-24.
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