http://www.outsideonline.com/fitness/outside-fitness-center/Why-You-Need-to-Be-Doing-Burpees.html?page=3
還有Walter Bortz 的”The Roadmap to 100".
http://www.outsideonline.com/fitness/outside-fitness-center/Why-You-Need-to-Be-Doing-Burpees.html?page=3
還有Walter Bortz 的”The Roadmap to 100".
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