Dumbbell Biceps Curls: Why Supination?

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*******TheBestWayToExercise**** teaches the importance of supination during a dumbbell biceps curl. Please...
*******TheBestWayToExercise**** teaches the importance of supination during a dumbbell biceps curl. Please visit www.TheBestWayToExercise**** to learn all of Doug Jones' secrets to smart, simple, and speedy strength, stamina, stretching, and sustenance.
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