A simple grip variation on a biceps curl exercise can improve the muscle fiber recruitment of the elbow flexors. This simple trick can turn a preacher curl (aka Scott curl) into a Zottmann curl, which changes the activity of the biceps, brachialis and brachioradialis. This will ultimately translate into stronger and bigger biceps.Using a pronated grip on the eccentric portion takes most of the work away from the biceps brachii which has an ineffective line of pull in this position. The work is transferred to the brachialis and brachioradialis. Remember that eccentric contractions limit the number of muscle fibers recruited this means the load per motor unit is increased. Hence brachialis and brachioradialis will benefit from a greater training effect. Most trainees have very weak brachialis and brachioradialis from lack of work. This exercise offers a perfect fix. Note that you can use an offset grip that will increase difficulty. Moving your pinky finger to the inside of the plate ensures that the short head of the biceps is further challenged.Check this article: https://goo.gl/NkolwQ to learn how to integrate this exercise variation into your arms routine. To know more, please visit http://www.strengthsensei.com/Follow us on Facebook: http://www.facebook.com/strengthsenseiFollow us on Twitter: https://twitter.com/StrengthSenseiFollow us on Instagram: @strengthsensei1