Lay back on an incline bench and hold barbell just inside shoulder-width.
Position the bar over your head with arms fully extended.
Imagine bringing your armpits forward. This will create a stable shoulder position.
Don't let your wrist roll back.
Begin by lowering the bar behind your head in a semicircular movement keeping your elbows relatively fixed.
Feel your triceps eccentrically loading.
Elbows do not flare excessively internal or external.
Initiate the mind-muscle connection of creating and maintaining tension in the tricep throughout the exercise.
You can allow your elbows to track behind you slightly.
This will create a greater stretch in the tricep.
Extend your arms to bring the bar back to the starting position.
Bar follows the same semi-circular path as the eccentric.
*Tips*
Keep the weight light and aim for volume. Heavy weight can wreak havoc on your elbows if you perform the exercise incorrectly or attempt to progress too fast.