Get more from your sit-up and low back exercise routine when you add the dynamic and unstable ActivMotion Bar. In these abdominal and low back variations, you are tasked with stabilizing the bar as the free-moving internal weights shift. This forces you to engage more muscles as you try to maintain equilibrium, and absolutely rocks your core!
2014-02-17
ActivMotion Bar Abdominal and Low Back Variations (Exercise of the Week #6)
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