Originally Posted by
joewein
If you're standing to climb, you're probably lacking low enough gears
Either that or you're racing.
I stand for long stretches when I'm with my riding buddies who don't climb quite as well... so I get a strength workout grinding in a bigger gear while maintaining a slower speed to match their sit and spin aerobic workout speed.
I also stand frequently just to change positions and break things up during really long climbs... which is about all I do... well, the same climb over and over.