Build Mass Muscle

Learn how to do flat dumbbell flies using free weights and what muscles flat dumbbell flies work in this free exercise video lesson on using free weights. Expert: Manny Castro Bio: Manny Castro received his BS in Health Education/ Exercise Physiology and Ahtletic Training from Florida International University, and completed several internships in cardiac rehab, and strength and Filmmaker: Manuel Castro

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Weight Lifting by Darren Warmuth