This study aimed to identify the effect of the Dynavision device in improving the reaction time (response ) when performing the start of backstrocke swimming students swimming team - Yarmouk University . The researcher used the semi-experimental approach to fit the nature of the study and its objectives, and the study's sample was carefully chosen from among the Faculty of Physical Education students enrolled in the swimming course during the summer semester of 2023–2024 .The swimming team at the university taught six female students in specific excersises that used the Dynavision device to assess response time. Each encounter consisted of three and lasted 30 minutes, and the training period lasted six weeks. Standard deviations and computational averages were employed, together with a test (the T-Test) The results showed that utilizing the Dynavision device improved reaction time (response) when completing the commencement of a Backstroke swimming in the distance tests in the research sample. In light of the outcomes and findings, a number of recommendations were made, the most important of which was the importance of using the exercises—particularly with the Dynavision device—because of their influence on improving the capacity to begin other swimming types.