Punch your face with your palms facing out. Be careful to push up slowly. Fully stimulate the entire deltoid muscle. Of course, we can also stand with a barbell behind our neck. This method is aimed at auxiliary training, that is, after shoulder push. Maybe the middle and front part of deltoid muscle has been fully stimulated, but the back part of deltoid muscle can't be completely destroyed, so we need to stimulate our deltoid muscle back bundle more completely by standing on the barbell.
In the early training, if you feel that the two movements are too isolated to master the strength posture, you can consider changing to push-ups training.