The 2003 nationwide Youth Risk Behavior Survey (Center of Disease Control and Prevention [CDC], 2003) indicated that 33% of the students who took part in the survey did not participate in at least 20-minutes of vigorous PA on three or more of the past seven days and did not do at least 30-minutes of moderate PA on five or more of the past seven days.The survey also showed that 12% of students participated in no moderate or vigorous PA during the past seven days and only 28% of students attended physical education (PE) class daily, while 38% of the students watched three or more hours of television per day on an average school day (CDC, 2003). Furthermore, the CDC has reported that almost 62% of children aged nine to 13 do not participate in any organized PA during their non-school hours, and over 22% do not engage in any free-time PA (CDC, 2006b).