The seated triceps extension is a tremendous refinement exercise when completing your triceps routine. This exercise will help carve out that "horseshoe" look in your triceps. Perform this exercise while seated and begin the exercise by holding the dumbbell directly above your head. You can use your other arm as a brace to help keep your elbow in place. Slowly lower the weight behind your head until you feel a full stretch in your triceps. Then lift the weight back up to the point where your arm is almost locked out. Do not completely lock out your arm as this will keep constant stress on the muscle and will make it work harder.
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