lol.. do the powerstance, dont stand too stiff, headbang occasionally, if ur playing rhythm try to run around abit, jump around abit to get the crowd high, really really feel ur music, cause if u cant feel ur music urself, i doubt the crowd can.. dont be a zombie..
You don't have to fling your guitar around or whatever, just have to make sure you sound damn F***ING GOOD. Look at megadeth.
please tell that to John Petrucci.