Re: tri-set, how to do?
don't really see the point in doing 3 types of press back to back. Those movements are so similar you might as well do 1 long set of 1 type of press. If you were mixing up presses with other lifts like lateral raises, and working the different heads, it might be more worthwhile.
Also I don't recommend behind the neck press ever, because long term you'll get shoulder impingement from this.