Extend your arm holding the dumbbell above your head until it's vertical, making sure your other hand is on your hip or at your side for balance.
Slowly bend your elbow, lowering the dumbbell behind your head until your arm forms a 90-degree angle, keeping your upper arm and elbow stationary.
Use your triceps to return the dumbbell back to the starting position, extending your arm fully.
Repeat this movement for the desired number of repetitions and then switch to the other arm if you're working one arm at a time.
Pro Tip
Controlled Movement: Avoid the mistake of trying to lift too heavy too soon. Choose a weight that allows you to perform the exercise with control. The movement should be slow and deliberate, not fast and jerky. This helps to ensure that your muscles, not momentum, are doing the work. Full Range of Motion: To get the most out of the exercise, fully extend your arms at the top of the movement and slowly lower the weight back down. A common mistake is to only perform half reps, which won't fully engage the triceps. Keep your Elbows Close: Your elbows should be close to your head throughout the exercise. Allowing them to flare out can put unnecessary strain on your shoulder