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Using the methods of literature material, questionnaire, test and mathematical statistics, the research analyzed self-defense from the perspective of the physical quality of juniors. Through s testing physical quality of in secondary school in Beijing as an example, this paper proposed that the students' physical quality is concerned, and the main problem existed in endurance and strength. The results indicated improving juniors' physical quality is the basis to improving the ability of self-defense and to help students handle threating situations effectively and with minimal confrontation.

On the Self-defense of Juniors Based on Physical and Mental Quality