Step into a CrossFit gym anywhere, and you're bound see people doing box jumps. Watching someone jump on and off a high box quickly is intimidating, but it doesn't have to be. Yumi Lee, owner of Reebok CrossFit LAB, shows that box jumps can be mastered, but in baby steps. Learn how to do this explosive move to build strength, get the heart rate up, and challenge agility and balance all in one!
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