lemme try to explain..
finger a powerchord (only root and fifth - no octave)
then play the two notes (root and fifth) alternately like
x----5----5-----5----5
x--3----3----3-----3--
in that case inwardpicing would be UDUD (root up, fifth down) - so you are moving the pic *inside* (or between) the two strings
outward picking would be the other way round DUDU (root down, fifth up) - so you are hitting the strings from above and below - the outside of the chord.
if you can do both fluently and at any speed and changing it at any time, you´ll never have troubles with any runs that involve uncomfortable pick-movements
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