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The background of this research is the researchers noticed that the warming up and warming down an important aspect in the practice session . The students need to do it right , to maximize performance and minimize the risk of injury . Focus issues in this research is how the activity of warming up and warming down on student extracurricular sports in Junior High School as the Kecamatan Semarang Timur, Semarang.This research is a qualitative descriptive analysis of the percentage approach , while the data collection methods used by the researchers are observation, questionnaire, interviews, and documentation. Informants in this reasearch is the interview of principals, student non-academic , extracurricular sports teacher and custodian of a Junior High School in Kecamatan Semarang Timur, while filling the questionnaire respondents are 139 students who take extracurricular sports at a Junior High School Kecamatan Semarang Timur.The results of observations about warming up and warming down activities on student extracurricular sports in Junior High School as the Kecamatan Semarang Timur, Semarang is, the activity of the general warming up and stretching is good if judged by the quantity and intensity but very less if judged by the quality and effectiveness . Specifik warming up activity has been pretty good, just too short duration . Warming down activity in the category of less, from 6 existing extracurricular , only 2 extracurricular warming down after doing exercises, and even then with a very short duration. The results of the calculation of the questionnaire showed a general warming up and stretching activities in both categories at all ( 59.71 % ), whereas the activity of specific warming up in enough categories ( 50.36 % ), and activity sufficient warming down in the category ( 48.92 % ).It can be concluded that, activity warming up and warming down in extracurricular sports students in Junior High School as the Kecamatan Semarang Timur is good enough. It's just a lot of factors that make the implementation was not optimal, such as a lack of supervision of the coach when the students warmed up, the lack of knowledge of students about the functions and benefits of warming and cooling, the duration of the activity and the lack of heating and cooling is done. Hope researchers through this research, the coach can provide insight to students about the functions and benefits of warming up and warming down, with limited time coaches should be more creative in making exercise program, especially warming up and warming down, and the governing body of each sport provide warming up materials and warming down periodically for coaches.