Background and Aim: The present study aimed to investigate the effect of rhythmic exercises with music on the trampoline on motor ability and balance of educable mentally retarded children.
 Methods: This research used a semi-experimental method with pre-test and post-test designs for two experimental and control groups. The statistical sample of the research was 30 educable mentally retarded children who were 9-10 years and were selected as available. Bruininks-Oseretsky (BOTMP), time up and get (TUG) tests were used to measure fine motor skills and balance, respectively. Using the counterbalance method. The experimental group performed exercises on a trampoline for eight weeks, and the control group did not receive any intervention. After the intervention, a post-test similar to the pre-test was conducted. After six months, the follow-up period was taken from samples of both groups.
Results: The results of Mixed ANOVA showed that rhythmic exercises with music on the trampoline had a significant effect on children's fine motor skills and balance from pre-test to post-test, so 91% of the changes in children's fine motor skills and balance were influenced by rhythmic exercises on the trampoline.
Conclusion: In the follow-up test after six months, there was no significant difference in fine motor skills between the two groups. The balance of the experimental group was better than that of the control group. So, it can be said that rhythmic exercises with music on the trampoline are effective in the rehabilitation of educable mentally retarded children, and this method can be used in the movement rehabilitation of these children in schools.