Good question Charlie. Because they are DB's , grips and positioning can be varie, and most variations are all good. If held at the shoulders, palms and elbows out, it is more like a military press, hitting the front side more. When held semisupinated, elbows out at around 90 degrees, with palms facing, you're bring the whole shoulder girdle (to include upper back) into the mix, and because I do a lot of Barbell work, this is my choice for the DB's , as it gets a lot of the shoulder area that could be missed with front MP's I also do a lot of behind the neck stuff too, but you really should go slow on that one, and get flexibility in the shoulders before seriously working with it. It doesn't work for all people, especially those that have tight shoulder girdles.