Katharine Hepburn was one of the first great Hollywood actresses to not only "exercise vigorously" but to admit it. Her parents encouraged her from childhood to "work her body to its highest potential," and she loved all kinds of sports (swimming, golf, and tennis especially). Hepburn prided herself on doing all her own stunts well into her 60s. At 84 years old, she said she could still stand on her head, walk on her hands, and somersault off a diving board. That's one admiral bag of party tricks!