Performing the: A Step-by-Step Tutorial Dumbbell Standing One Arm Extension
Extend the arm holding the dumbbell above your head, fully extending your arm so the dumbbell is directly above your shoulder.
Slowly bend your elbow, lowering the dumbbell behind your head while keeping your upper arm stationary. Make sure your other hand is either at your side or on your hip to maintain balance.
Lower the dumbbell until your forearm is parallel to the floor, then slowly raise the dumbbell back to the starting position, fully extending your arm.
Repeat this motion for your desired number of repetitions before switching to the other arm.