There is considerable evidence to suggest that weight-bearing exercises in adults helps prevent osteoporosis. In setting up a study to investigate the affects of a regular walking program on the incidence of osteoporosis several confounding variables may affect the relationship between the independent variable (walking) and the dependent variable (osteoporosis).    List three confounding variables, if not controlled or minimised, that may mask a relationship between walking and osteoporosis.

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Spheres of physical activity

The spheres of physical activity experience include aspects of everyday life where physical activity is important. In general, the spheres recognize various purposes of physical activity in different contexts. The spheres of physical activity provide a broad basis for assessing the significance and prevalence of physical activity. There are seven spheres of physical activity experience.