Summary: http://fitness.mercola.com/sites/fitness/videos.aspx Dr. Mercola and the world class athlete and personal trainer Darin Steen demonstrate the proper way of performing the lying one arm dumbbell extension.
Summary: http://fitness.mercola.com/sites/fitness/videos.aspx Dr. Mercola and the world class athlete and personal trainer Darin Steen demonstrate the proper way of performing the lying one arm dumbbell extension.