Can't resist chiming in when the topic is the Overhead Press.
Seated vs. Standing Overhead Press
-Standing works more muscles: back, legs, core, you need to stabilize the weight using your whole body. It's a full body exercise.
-Seated easier, less muscles worked, good to give your lower back some rest.
If you train both, you won't see much difference in strength between seated & standing Overhead Press. Keith Wassung for example has a 340lbs overhead press & 345lbs seated press.
Behind Neck vs. Anterior shoulders
-Be sure you have healthy shoulders before trying behind neck. If you're stiff in the shoulders, you'll hurt yourself doing behind neck presses. I'm not saying BNP causes shoulder injury, what I mean is they will show existing problems.
-You'll be stronger pressing from the anterior shoulders than from the neck.
Overhead Press vs. Olympic Press
-there's nothing wrong with leaning back on the Overhead Press. The starting position has the back leaned back, it's the only way to lift your chest up & decrease the rom. If you're back is inflexible that's something you need to work on. Technique is technique. And correct technique means more weight.
-difference between overhead & olympic press: on the overhead press the back slightly leans back when starting the press, then it goes forward. The back doesn't go back anymore once the bar leaves your shoulders.
-On the olympic press the back goes to the back when the bar leaves your shoulders. You're going "under the bar" not really pressing. This makes it far easier, compare with a jerk but without the jumping.
Push Press
-push presses are great to overload your shoulders & develop speed. But they also work your shoulders to a lesser degree. If you want your overhead press & pure shoulder strength to go up, you need to overhead press. Push press is leg drive to get weight at forehead level + triceps to lockout. Overhead Press is pure shoulder strength up to you forehead.