1 Arm Tricep Extension

Hold a suitably weighted dumbbell in your right hand, keeping your arm straight, using your left hand to fix the upper arm close to your head.

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Smoothly lower the dumbbell down behind your head, ideally to a position whereby your biceps and forearms touch, however beginners should aim to bend the arm to a 90-degree angle.

Throughout the movement, focus on keeping your upper arm vertical with the elbow close to your head, in order to help isolate the tricep muscle.

Repeat for desired number of reps, prior to changing to the other arm.