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Symons Downs, D.; Nigg, C. R.; Hausenblas, H. A.; Rauff, E. L. (2014). Why Do People Change Physical Activity Behavior. In: Nigg, Claudio R. (ed.) ACSM’s Behavioral Aspects of Physical Activity and Exercise (pp. 1-38). Philadelphia, PA: Wolters Kluwer/Lippincott Williams & Wilkins