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This study is designed to determine the effects of such sports activities as 50-meter running, standing broad jump, push-up, sit-up, sit and trunk flexion and long-distance running-walking practiced by the 3rd graders of a male middle school who have participated for longer than one year in the sports programs for special aptitude during after-school hours. The findings of this study may be summed up as follows: First, the exercising group who participated in the sports program after class hours marked higher points than the control group in such dexterous exercise as standing broad jump. Second, the exercising group who practiced the sports program during after-school hours yielded greater numbers in such muscular tenacity items as push-up and sit-up than those of the control group. Third, no significant difference was found in sit and trunk flexion as flexibility item between the exercising and control groups who participated jointly in the sports program during after-school hours. Fourth, records were bettered by the exercising group compared to the comparison group in the cardio-pulmonary tenacity items such as long -distance running-walking. Fifth, high relevance was revealed to exist among physical strength items, and obvious relevance was confirmed between 50-meter running and dexterous standing broad jump but no evident link could be found in the muscular tenacity items such as push-up and sit-up.