The biceps curl is usually performed with the palms supinated (facing upwards). Turning the palms inward transfers load from the biceps to the brachioradialis. Variations on this concept include the hammer curl, performed with the palm inward, neither pronated nor supinated, and the reverse curl, with the palms pronated (facing downwards). Yet another variation, the Bench Press Curl, is unique in that it requires two people to function properly in. One, lying on the bench (similar to bench press) lowers the weight eccentricly to 1/2 the ROM as seen in bench press, and the other trainee, standing over the bar, actively curls the bar upwards (essentially a barbell curl) as the other actively presses up. -Wiki-
