The Strength Axle is a cutting-edge fitness device that focuses on functional core strength. But it also hits muscles throughout the body while also boosting your heart rate. Inventor Craig Thompson developed this idea, then built the original model by hacking up plumbing pipes that he bought at The Home Depot. Now CrossFit gyms and other workout facilities are adding the Strength Axle to their selections. Check out how it was designed and why it works:

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