108 Journal of Research

Generally, childrenʼs physical activity participation during after-school periods refl ects childrenʼs choices of physical activity. To understand middle school childrenʼs choices of after-school physical activity, the Self-Administered Physical Activity Checklist were administered to 187 middle school children (86 boys and 101 girls). Descriptive and inferential statistics were used to identify differences in physical activity choices and yielded the following fi ndings. While lifetime physical activities ranked the top in the numbers of participation, competitive sports were the fi rst contributor to childrenʼs after-school physical activity amounts, and this observation was related to the abundant structured competitive sports but limited structured lifetime physical activities available. In addition, the children spent signifi cantly more time in moderate physical activities than vigorous physical activities, bu