You should try it sometime. Unlike climbing in an indoor gym, upper body strength is not an issue at all until the higher grades. It's very fun, especially at Yosemite. In fact, feel free to PM me, if you want, the next time you go to Yosemite and if I'm still around I'd be happy to "show you the ropes". I haven't tried El Cap yet.
Here's a picture of me climbing a route called Crescent Arch on Daff Dome, which is in Tuolumne Meadows (also a part of Yosemite National Park):
http://i92.photobucket.com/albums/l1...tim/meonca.jpg

