I get a real good buzz from my cycle to work, especially in the spring and summer months when everything is in full bloom. I love being out in the open air rather than the gym, so by the time I get to work I've had a good lung full of fresh air to get my day off to a refreshing start.
There's nothing quite like be able to get somewhere under your own steam rather than sitting in the car and getting stuck in traffic with the usual frustrations that driving brings. Also, when I've finished work I know I have to cycle home even if I can't be bothered but by the time I'm home I'm glad I've done it, by comparison if I was going to the gym or an exercise class I would probably shy off.
I already had my bike when I decided to start cycling to work so I didn't have to go out and buy one, so to me it doesn't cost me anything, it's non-polluting and it's keeping me fit and healthy.
I don't mind admitting that I choose not to cycle during the winter months because it's cold, wet and dark, that really wouldn't suit me at all... but by the spring I'm really looking forward to it again, can't wait!!!