Chart 9G. Prevalence of students in grades 9–12 who participated in sufficient vigorous or moderate physical activity during the past 7 days by race/ethnicity and sex (YRBS: 2003). Note: "Sufficient vigorous activity" is defined as activity causing sweating and hard breathing for at least 20 minutes on 3 or more of the 7 days of the week. "Sufficient moderate activity" is defined as activities that did not cause sweating or hard breathing, lasting for at least 30 minutes on 5 or more of the 7 days of the week. Source: MMWR.²³⁷