How to do Concentration Dumbbell Curls (Biceps Exercise)

Bertus Engelbrecht
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http://HelloSixPackAbs.com - Instructional video demonstrating how to do Concentration Dumbbell Curls as a Biceps Exercise. This is an excellent bicep exercise, because it eliminates all other arm movement and puts all the focus on your biceps. For more exercise instructions, workouts, guides and all the tools you need to start working out visit Hellosixpackabs.

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