Every morning last week Dr. Wilhelm Raab, 65, just retired as professor of experimental medicine at the University of Vermont, did 500 half knee bends with arm swings. Before retiring he did another 500. His Boston-born wife Olga. 54, did knee bends too, but usually quit before she hit 200 because, she admits, "I get to giggling over how we must look." Vienna-born Dr. Raab could not care less how he looks so long as he is warding off what he calls "loafer's heart." Dr. Raab never rides in a car or elevator if he can avoid it, wears out six...
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