Sit on a bench with a pair of dumbbells. Hold the dumbbells with a semi-supinated (palms facing each other) grip so that the thumb side of your hand is contacting the inside of the dumbbell plate. Thus, you are holding the dumbbells "offset." As you curl the weights upward, turn the dumbbells to a supinated (palms up) position. As you lower them, go back to your original semi-supinated grip. The thumb side of each hand should stay in contact with the inside of the dumbbell plate throughout the exercise.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.