I have a question about spinning/riding out of the saddle. Seems some folks have a really hard time with this. For someone with much more experience than me, can you give us some insight?

My only experience was when I was testing bikes. I was down to two bikes and when I rode one of them, it was really HARD to get out of the saddle. I "think" it's really because the bike was too short for me (from saddle to handlebars). When I rode the other bike (the one I bought) it was really easy to get out of the saddle and ride. I bought the bike I could ride easily out of the saddle, since I figured I'd need this capability for hills.

So, anyone with insight on this problem? Does bike fit play a big part in riding out of the saddle?