Only 1 Bicep Exercise you Need: Zottman Curl: While Concentric: Biceps, Forearm Flexor, Brachioradialis While Eccentric: Radialis, Forearm Extensor and Brachioradialis Unlike most other curls, which only directly target the biceps muscles (and in some cases like the hammer curl, the brachialis), the Zottman curl is designed to engage your forearms as well. Direct forearm training is too often ignored in standard workout splits, which is unfortunate since the muscles are essential for proportiona