Abstract
The purpose of this study is to find out the effects of after school sports activities on the physical fitness of mentally disabled adolescents and to improve their basic physical abilities and functions so that they could adequately cope with P.E. classes. To examine the effects of after school sports activities, a program of sports activities was implemented for seven(mild disability-3, and severe disability-4) 11th graders at C high school in Cheongju-si, Chungbuk. It can be said that the program of sports activities has a positive effect on the improvement of quickness, flexibility of the mentally disabled adolescents. But, it can be said that the program of sports activities does not have any effect on the improvement of muscular endurance, agility, endurance of the mentally disabled adolescents. Therefore, it can be said that the program of sports activities has a positive effect on the improvement of flexibility of the mentally disabled adolescents.