Physical exercises (PEs) are one of the most used approaches by researchers to treat restricted and repetitive behaviors (RRBs) and enhance on-task behaviors in students with high-functioning Autism spectrum disorders (ASD). Although PEs is recognized as Evidence-based Practices (EBPs) for students with ASD in the United States of America (USA) that are based on moderate evidence, it is important to conduct more empirical studies to explore its effects on individuals with ASD from different populations in the KSA. The current study used a single-subject, multiple baseline design across subjects to examine the effect of antecedent structured physical exercises (teaching soccer skills) on increasing on-task behaviors and decreasing RRBs of high-functioning students with ASD in the Kingdom of Saudi Arabia (KSA). The results of this study are consistent with earlier findings that, in an elementary school setting, antecedent PEs decreased RRBs in students with ASD. Even after the intervention had been disconnected for two weeks, the dependent variables' favorable changes remained consistent. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]