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Background: Critical thinking is not only about people who always argue or give wrong assumption but also can give a solution from a problem and having the appropriate, rational, and careful basic so then it can effectively produce solutions to solve the problems. A critical thinking skill is the characteristic of divergent thinking in the high order thinking level which should be possessed by students in facing the industrial revolution era 4.0. Aim: This research aims to improve students- critical thinking skill through the modification of rhythmic activity in physical education at junior high school. Method: This research used classroom action research method in the form of collaborative action research. The source of data in this research was students of grade VIII SMP 2 Sentolo, Kulon Progo, Yogyakarta, academic year 2018/2019 which consisted of 28 students specifically 11 male students and 17 female students. The data collection technique used in this research was critical thinking test through the modification of rhythmic activity and observation. The technique of data analysis used in this research was descriptive-comparative technique which compares qualitative data from the condition of early study, cycle I and cycle II with the percentage. Result: This research shows that from the early condition, from 28 students only 9 students or 32,1% who are successful and in the cycle I was improved becoming 16 students or 57,1%, and in the cycle II was improved becoming 23 students or 82,1%. Conclusion: There are improvements in students- critical thinking skill through the rhythmic activity in physical education at Junior High School.