Physical activity history and attitudes of middle-aged men.
D000124:Achievement; D001294:Attitude to Health; D003163:Competitive Behavior; D004522:Educational Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D010555:Personality Inventory; D010806:Physical Education and Training; D005082:Physical Exertion; D010809:Physical Fitness; D013177:Sports; D014505:Urban Population