best shoulder building weight exercises that are not common knowledge?
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I have a Power Tower (which is a Total Gym on steriods) and can use an attachment at the lower end to do upside down shoulder presses (which is a version of a hand stand).
One comment, though: I know that massive, powerful deltoids are a guy thing. Don’t forget the little stabilizers inside that need to be in good working order to make the big ones look good.