<iframe width="580" height="385" src="https://www.youtube.com/embed/m7b2Zf9Vx8Y" frameborder="0" allowfullscreen></iframe> <br>During the vitamin lecture on the CrossFit Level 1 Certificate Course, CrossFit Seminar Staff member Dennis Marshall explains ... <br><a href="https://www.youtube.com/watch?v=m7b2Zf9Vx8Y">source</a>
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