In the event you relaxation your arms within the preacher curl bench, you minimise the involvement of other muscle groups, which include the deltoids or upper again. This permits for a far more concentrated and extreme contraction in the biceps. Since the title implies, the standing preacher curl could be the standing Variation https://www.theorthopaedicandpainpractice.com/understanding-burning-pain-in-the-upper-right-arm-causes-symptoms-and-treatment-options/