“…Twelve of these studies had positive effects on students' health-related fitness knowledge, six studies had a positive effect on students' physical activity levels, and five studies significantly influenced students' fitness levels. Seven of these 12 studies revealed intervention effects both on health-related fitness knowledge and on physical activity (four studies: Harrell et al, 1996;Killen et al, 1989;Manios & Kafatos, 1999;Marcus, Channing Wheeler, Cullen, & Crane, 1987) or fitness levels (three studies: Bush, Zuckerman, Taggart, et al, 1989;Fardy, White, Haltiwanger-Schmitz, & Magel, 1996;Perry et al, 2002). Finally, the results concerning the one study by Caballero et al (2003) with a high methodological quality are unclear because on the one hand, positive effects on students' physical activity were revealed from the data assessed by questionnaire and on the other hand, no intervention effects were shown from the data assessed by a physical activity motion sensor.…”