Shelley divulged her "slim 'n' trim secrets" in this 1979 article about her diet and exercise routine. She revealed that she got enough exercise daily by jogging and walking and if she's free, she'd go for a swim. She didn't starve her body of all good foods but, instead, stuck to a sensible diet of fruits, vegetables, fish and chicken. Occasionally, she would have a steak. Great tips.
