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![How To Do 21s [one of the best bicep exercises] - YouTube](https://i.ytimg.com/vi/oq7jXQP3Fk8/maxresdefault.jpg "How To Do 21s [one of the best bicep exercises] - YouTube")
How To Do 21s [one of the best bicep exercises] - YouTube
21's Bicep Curl - YouTube
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What Are Biceps 21s? - SET FOR SET
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