An isolation arm exercise performed on a preacher bench using a dumbbell with a neutral (hammer) grip, working one arm at a time. The upper arm is fully supported against the angled pad while the dumbbell is curled upward by flexing the elbow, reducing momentum and maximizing isolation. The movement emphasizes strict unilateral control and stable shoulder positioning, followed by a slow and controlled lowering phase to maintain continuous tension through the forearms and upper arm muscles across the full range of motion.
Log your dumbbell one arm hammer preacher curl sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.