While physical activity is beneficial for youth with developmental disabilities, little is known about those individuals' fitness profile and levels of activity. Therefore the purpose of this study was to investigate the physical fitness profile and physical activity level of 30 adolescents with and without Asperger syndrome (AS). Evaluations were done using the Eurofit physical fitness test and the Baecke Habitual Physical Activity questionnaire. A 2 x 2 MANOVA indicated that adolescents with AS scored significantly lower than the comparison group on all physical fitness subtests, including balance, coordination, flexibility, muscular strength, running speed, and cardio-respiratory endurance (p less than 0.001). Adolescents with AS were also less physically active (p less than 0.001). Engagement in physical activities is therefore recommended. (Contains 3 tables.)