A study assessing daily PA levels in 2,410 third grade students from four geographical regions in the United States (US) found that students reported an average of 90- minutes of moderate-to-vigorous PA per day. However, 36% of the students reported less than 60-minutes of moderate-to-vigorous PA per day and 13% reported less than 30-minutes of moderate-to-vigorous PA per day (Simons-Morton et al., 1997).