Biceps curl is any of a number of weight training exercises that target the biceps-brachii muscle to develop one or more of the following qualities:. Although the exercises differ, a common factor of each is a movement "curling", where a team weight-linked article listed above-is moved through an arc, using mostly the strength of the biceps. The bicep muscle contracts to lift the weight up through the arch, to a point where no further movement is possible. The biceps is then extended, lowering the weight back through the arc, the start position. This contraction and extension together constitute a single repetition. Several variations on the biceps curl transfer some of the burden of the biceps to other elbow flexors. A group of variations involves postures that hold the elbows in front of the trunk, shortening the biceps and brachialis force to do more work. Variations on this theme include the preacher curl where the elbows rest on an incline bench, the concentration curl where the elbow rests against the inside of the knee, and prone to curl performed lying prone slope in an inclined bench, where the force of gravity holds the upper arms in front of the trunk. The biceps curl is usually performed with the palms supinated (facing upwards). Turn inside the palms shifts the burden of biceps brachioradialis. Variations on this concept include the hammer curl, performed with the inside of the palm, or pronated nor supinated, [1] and reverse curl, palms pronated (facing downwards). [2] Another variation, the Morelli Curl uses a traditional over-under or powerlifting grip with a palm supinated and the other pronated. The concentric lift component is emphasized in the pronated arm, while the eccentric component emphasizes supinated arm.

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