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One solution is to summate all available evidence in as many areas of daily activities as possible and then draw tentative conclusions. This review summarises available trend data on direct representations of physical activity in a range of contexts, together with indirect measures such as sedentariness, fitness, and attitudes. The conclusions drawn are: physical activity in clearly defined contexts such as active transport, school physical education, and organised sports is declining in many countries; young people would like to be active but are often constrained by external factors such as school policy or curricula, parental rules in relation to safety and convenience, and physical environmental factors.<\/jats:p>","DOI":"10.1136\/bjsm.2004.016675","type":"journal-article","created":{"date-parts":[[2005,11,23]],"date-time":"2005-11-23T21:48:24Z","timestamp":1132782504000},"page":"892-897","source":"Crossref","is-referenced-by-count":283,"title":["Evidence for secular trends in children\u2019s physical activity behaviour"],"prefix":"10.1136","volume":"39","author":[{"given":"J","family":"Dollman","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K","family":"Norton","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L","family":"Norton","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2005,11,23]]},"reference":[{"key":"2024051312262540000_39.12.892.1","unstructured":"Australian Bureau of Statistics. 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