Introduction: Autism is one of the developmental disorders that begins in childhood and affects various areas od activity, it is complex, comprehensive and lasts a lifetime. A quality selection of rehablitation and adaptation of various forms of therapy for people wit autism spectrum disorder can gentlz contribute to the quality of lie. The topic of the research is wether adapted content from swimming therapy in working with children on the autism spectrum disorder affects individual motor activities as well as improvements after traning. Participans and methods: 27 respondents took parti n the research, of which 26 were boys and 1 girl between the ages od 8 and 18 with a diagnosis o fan autism spectrum disorder. All 27 children attend school within the Center for Autism in Rijeka. In the research, we used two criteria: the criterion for inclusion in swimming club prescribed by HPSS and the criterion of swimming knowledge in the Republic of Croatia and through swimming therapy of 12 training sessions with professional guidance and costomized individualized and group work lasting 45 minutes. The obtained test results were processed using Microsoft Excel 2016 and Statistica (Version 13.05.17) program. Results: After 12 sessions of therapeutic swimming with adapted exercises, a significant increase in the number of activities was observed in people with PSA. According to both swimming criteria in the Republic of Croatia, the participants showed improvement in motor skills, coordination and independence in performing swimming tasks. The results od the Hi-squere test showed a significant increase in the number of activities according to the criteria for participation in swimming sports. The Mc Nemar test revealed a statistically significent difference in progres sin the second level of swimming knowledge, while there were no significant changes in the first level. This confirms that therapeutic swimming can have positive impact on the physical activity and ability of people. Data analysis showed a postive correlation between age and the speed of performing adapted exercises in one of the swiming criteria. PSA, helping them become more active and functional in their daily lives. These results confirm both hypotheses and provide a solid foundation for further research on therapeutic approaches in people with PSA. Conclusion: Based on the research conducted and the goals set, we can conclude that therapeutic swimming with adapted exercises has a positive effect on people with PSA. The results showed that after 12 sessions od therapeutic swimming i both criteria, the number of activities increased significantly according to both swimming criteria, which confirms the firt hypothesis (H1). Also, a positive correlation was found between the age of the subjects and the speed of performing the adapted exercises, which confirms the secon hypothesis (H2). ​These results show that even older children achieve positive results even though they are often faced with greater challenges in motor skills.