Calisthenics might bring back memories of 80s leg-warmers, but recently it has exploded on social media as a fitness phenomenon. The hashtag #calisthenics has racked up over 18.5 billion views on ...

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Calisthenics may conjure up images of grade school P.E. class, but recently it has become a social media fitness sensation. The hashtag #calisthenics has more than 18.5 billion views on TikTok and ...