This concept alone would justify the practice and training of these lifts. Some of our favorite and most developmental lifts lack this quality. Set-up: Take bar from supports or clean to racked position. The elbows are below and in front of bar.
How to Do a Shoulder Press: The Ultimate Guide
Push press - Wikipedia
Overhead pressing movements are the gravy when it comes to creating a great set of shoulders. Although many may choose to do them a bit differently, the strict press, push press and push jerk are the big 3 in creating strength, size and explosiveness in the delts. Unlike the other two movements, the strict press is a lot more controlled and can be performed with variations of grips to hit different parts of the deltoids. It also only uses the delts and upper back to control the weight up and down, not the rest of the body.
Overhead Press: How to Explode your Shoulder Strength
A push press is a weight training exercise for the anterior head of the deltoid shoulder. The push press is similar to the military press ; however, the movement is started by a 'push' from the legs. This begins the momentum of the movement, the weight is then slowly lowered back to the chest  or dropped from overhead. It can also be used from behind the neck. Behind the neck push presses are not recommended though due to an increased risk of injury.
You can push jerk more than you can push press, and you can push press more than you can shoulder press. No secret there. But did you know that most can push press roughly 30 percent more than they can shoulder press and push jerk roughly 30 percent more than they can push press? Although not an obvious core-to-extremity movement, the shoulder press requires midline stabilization, says HQ trainer Matt Chan.