I trim it all down shorter. Chest, legs, arms, crotch, butt and back. Sadly I have hair, long and a lot everywhere but the top of my head. <grin>
Summer time it seems to me that short to no hair helps get the sweat away from my skin quicker as well as taking the heat away with it. Also seems that it help ensure my clothing moves with me instead of giving my clothes something to slide on and create raw spots.