Originally Posted by merlinextraligh

Unless it's a hilly course and you're doing it climbing, this is a seriously bad answer. You're making yourself much less aero, and the power output for that one or two mph is huge compared to staying in your aero psition. You need to train to be able to put out power the length of the TT maintaining a good aero postion.

If you feel the need to get out of the aerobars and stand, on a flat course, you're position needs work, or you need to get better acclimated to your position.