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The parts that long-distance swimmers themselves talk about and practice the most are rolling and underwater strokes. Long-distance swimmers seem to pay a lot of attention to stroke movements because they need to optimize upper body movements and do efficient freestyle swimming well. They use beat kicks depending on the situation. Those who are going to challenge themselves in long-distance swimming should practice the movements in the video. Have fun swimming. ^^ / swimyesul https://tv.naver.com/ysswim