CrossFit Seminar Staff member Julie Foucher demonstrates the glute-ham-developer back extension. For more info on CrossFit’s Trainer Courses: http://www.crossfit.com/cf-info/certs.shtml CrossFit® – Forging Elite Fitness® (http://crossfit.com) The CrossFit Games® – The Sport of Fitness™ The Fittest On Earth™
Erector Spinae Back Extension-16
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