Dumbbell Tricep Extension - Pronated Grip
Stand up straight with a dumbbell held by both hands. Your feet should be about shoulder width apart from each other. Lift the dumbbell over your head until your both arms are fully extended. The resistance should be resting in the palms of your hands with your thumbs around it. Slowly lower the resistance behind your head, keeping your upper arms stationary. Then lift the dumbbell back to the starting position by using the triceps to raise the dumbbell. Keep your upper arms stationary throughout.