Development of Tools Speed of Blow Reaction Android-Based in Pencak Silat

: The purpose of this research is to make a training tool for the speed of reaction in pencak silat. The sample in this study
amounted to 60 people coming from the Sports Coaching students of Medan State University The small group test involving 20
students. The large group test involving 40 students. This research uses the Research and Development Method. Research and
Development Method is a research method used to produce certain products, and test the effectiveness of these products. Pencak
silat's reaction speed training equipment is valid according to experts' assessment and has been reliable for use in the training
process as evidenced by the results of the consistency of the results of the test, this tool has the benefit of the user in terms of the
application of technology in sports and the development of martial arts sports performance going forward.