Jack LaLanne was an American fitness, exercise and nutrional expert who is sometimes called "the godfather of fitness" and "the first fitness superhero".
Perhaps he is best-known for his early morning excercise programs which started in the early 1960's. Some of them can be seen on YouTube. He makes the program fun and he keeps it interesting. The most impressive thing about him is his enthusiasm and positive outlook. Here's the first show on YouTube:
I found some other photographs of Jack LaLanne, which will probably be of interest to fans of Animan's World. These are his physique photos, probably taken during the 1950's. They are beautiful!