Jack LaLanne
Francois Henri Jack LaLanne was an American fitness, exercise, and nutritional expert and motivational speaker who is sometimes called the godfather of fitness and the first fitness superhero. He described himself as being a sugarholic and a junk food junkie until he was 15. He also had behavioral problems, but turned his life around after listening to a public lecture about the benefits of good nutrition. During his career, he came to believe that the countrys overall health depended on the health of its population, writing that physical culture and nutritionis the salvation of America.
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Source: Wikipedia