Performing the: A Step-by-Step Tutorial Dumbbell Hammer Preacher Curl
Place your upper arms and chest against the preacher bench, fully extending your arm so that the dumbbell is lowered towards the floor.
Slowly curl the dumbbell up while keeping your palm facing your torso, making sure to only move your forearm and not your upper arm.
Hold the position when the dumbbell is at shoulder level for a moment, squeezing your biceps.
Gradually lower the dumbbell back to the starting position, fully extending your arm, and repeat the movement for the desired number of repetitions before switching to the other arm.