If done correctly, I think yoga is a great complement to any fitness routine. Like Veronica, I credit it for allowing me to go from being a couch potato to cycling 5k miles a year without much pain or injury. For me, it's been especially helpful in loosening up my hamstrings and hips. It's also great for my core, balance and overall body awareness.
Beyond that, it's been a wonderful stress reducer. When I first got serious about it, I was going through a difficult time emotionally and it did wonders for my soul thanks to a very spiritual instructor. I don't think you have to embrace the spiritual aspects of yoga to benefit from it, but I found it to be very enlightening. I've also met some wonderful people at my yoga studio.
I say all this with the caveat that it is important to find a good instructor. I know there are some good products on the market for developing a home practice but I think it's better to start at a studio with an experienced teacher. It is easy to hurt yourself and many of the poses are deceptively complicated.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher