A safer variation of the exercise for the triceps than the classic french barbell press.
Sit down on a bench with your back against the machine.
Firmly press your back against the machine.
Grasp the machine handle with your arms extended and with an underhand grip.
As you inhale, bend your elbows, but do not extend your elbows too far.
Straighten your arms, as you exhale.
This exercise is quite dangerous for the elbow joints so do not use a heavy weight.
To lay emphasis on the wrists joints, use an EZ curl barbell.