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This video is about the slow 300m interval of Yongbeom Kim, who runs the YouTube channel 'Marathon Friend' with his emotional runner junior Myunghak Kim. Yongbeom Kim is one of the juniors who inspired me the most while running marathons. Since he is a smart junior, he does not follow general training methods, but trains according to his own characteristics. The slow 300m interval is one of those training methods. #Interval #300mInterval #MarathonFriend #YongbeomKim #EmotionalRunnerMyunghakKim #Marathon #Running #RecordShortening #Jogging