Add Yahoo as a preferred source to see more of our stories on Google. Box jumps are a staple of CrossFit and group fitness classes, but is the up-and-down exercise really worth all the effort? “The ...
Instructor: Adam Knickelbein started taking CrossFit classes back in 2009 and has never looked back. In 2012, he received his CrossFit Level 1 Trainer certification. In 2014 he opened CrossFit Beat ...
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