AFTER transforming, He-Man shouts out that phrase and adds on a breastplate and two bracers, one of which has grippy tines, onto his armor. And that's it. Oh yeah, it was to sell toys so hard it's not even funny.
Well you can't really blame the producers for adding stuff to sell toys most kids shows do it, what you can get mad about is when they just smash stuff in for toys and hope we go for it.