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## PREFACE

The benefits of lifelong involvement in physical activity are well known. They include decreased risk of cardiovascular disease, hypertension, and diabetes (Katzmarzyk et al., 2003), as well as increased physical and mental health (Mazzeo et al., 1998). Despite these benefits, rates of physical activity typically decline with advancing age. Investigations of physical activity involvement across the lifespan show a trend toward peak involvement during early to mid adolescence, followed by decreasing involvement from that point forward (Crocker & Faulkner, 1999; De Knop et al., 1996).