The curl with a dumbbell is one of the basic exercises to develop strength and muscle volume of the Biceps brachii (arm muscle). The performer is standing or seated, a dumbbell in each hand, held in supination. Slowly he bends his elbow to bring the forearm on the arm, without the back moves. When the forearm is almost resting on the arm, running up to her elbow slightly so as to incur maximum biceps. Then, at the same speed as the rise, it drops the dumbbell at the thigh, and executes the movement with the other arm. This movement is similar to the curl with dumbbell alternating with the difference that the performer up both dumbbells simultaneously. It follows, therefore, the need to learn to keep your back straight and fixed during execution to avoid injury. The barbell curl can run simultaneously sitting or resting against a folder. This embodiment provides an alternative at the position of your hands. At the beginning of the dumbbell motion is maintained in semi-pronation. During the rise of the dumbbell, the hand rotates so that by the end of the execution, the dumbbell is held in supination. It also allows work brachioradialis. The barbell curl is running in isolation sitting, legs apart, one hand on the thigh and the other hand now the dumbbell on the floor. The elbow resting in the hollow of the thigh, running back up the dumbbell complete contraction of the biceps. Then it descends slowly, at the same speed as the rise. This movement is particularly suitable for developing the curved shape of the biceps are looking for practitioners of bodybuilding. The jack hammer curl is not only to develop the biceps, but put the effort on one of the main muscles of the forearm, the brachioradialis. The performance is similar to the alternating dumbbell curl or curl with dumbbells simultaneously, with the difference that the dumbbell is held in semi-pronation throughout the execution. Copyright Text is available under Creative Commons Attribution Share-Alike, other conditions may apply. See Terms of Use for more details and credits graphics. If reused texts of this page, see how to cite authors and include the license. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc.., Charitable organization governed by section 501 (c) (3) tax United States.

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