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To examine whether the stages of change of exercise adoption appropriately address strenuous, moderate, and mild intensities of physical activity.

Secondary analysis of four data sets investigating transtheoretical model (TTM) constructs for exercise adoption.

Four samples of differing age groups (adolescents, n = 400; college students, n = 240; adults, n = 346; seniors, n = 504).

Stage of change algorithm for exercise adoption and self-reported physical activity.

Multivariate analysis of variance (MANOVA) results showed that stages of change were distinguished by strenuous and moderate but not mild exercise in the adolescent, college student, and adult sample. In the senior sample, stage differences were found in the frequency of exercising (equivalent for moderate to strenuous exercise) and the frequency of walking (equivalent for mild exercise). Bivariate …