Preachers curl is a type of bicep exercise that is quite effective to build bicep muscles. 3 sets of preacher’s curl are recommended for the least of 10 months for good results. To do this exercise, place arms on the exercise pad and lift weight bar of adequate weight. Holding bar with both hands, bring it down steadily and bring it up. It is advised that motion should be of 3 seconds of 10 repetitions. Maintain a steady pace throughout and breathe properly. For maximum effect, weight of the bar should neither be too heavy nor too light.