I as well have noticed a bigger change since I started cycling than with any other sport or hobby I've picked up.

I kicked off a decent amount of weight almost immediately when I started riding, ~15 pounds which isn't too bad considering I'm not really overweight to begin with.

Cycling really helped increase my core strength and cardio endurance. I noticed a big improvement in my general fitness level which in turn caused me to climb harder (rock climbing, one of my passions). My body shape changed in that I kicked off a bit of the jiggle around my middle and back end, my legs and knees and butt tightened up a little, well a lot but I didn't really notice it until I'd been riding for some time.

I also ventured back into the gym with a determination to start running for the first time, and found I could jump right in cold turkey and run for about 15 minutes longer than I had ever been able to.

I started swim classes about a month ago after not swimming for about 6 years and found I was able to hang with the people who had been taking the class for a month already, and had little to no problems keeping my stamina up.

I saw a picture of myself from last summer and was amazed at how heavy I looked in my face. My cheeks were so chubby and my arms and shoulders so rounded. Now I'm nicely angular though still a bit curvy. It was nice to see the difference. All in all, good changes that I really attribute to cycling!