Regular exercise. A profile of the inactives.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001642:Bicycling; D005190:Family; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009426:Netherlands; D005082:Physical Exertion; D011897:Random Allocation; D012737:Sex Factors; D012959:Socioeconomic Factors; D013177:Sports; D011795:Surveys and Questionnaires