Build boulder shoulders on rails.
Keep your core braced and don't arch your lower back to push the weight up.
The machine's rails handle the balance, so the delts can push straight into the working range without stabilisers giving out first, and the triceps finish the press near lockout. That guided path makes it the safest way to take overhead pressing close to failure, no spotter, no bailing. It earns its slot for beginners learning the pattern and for experienced lifters stacking shoulder volume late in a session.
For growing the delts, it is extremely effective, because the fixed path lets you push closer to failure with less skill and less risk. Free-weight pressing builds more stability and carries over further, so most good programmes use both.
So the handles start level with your shoulders, roughly ear height, with your back flat against the pad. Starting too low turns the bottom of the rep into a grinding half press and beats up your shoulders.
You are pushing a weight your shoulders cannot press strictly, so your body creates an incline by arching. Plant your feet, keep your ribs down and your back against the pad, and drop the pin until the press stays honest.
