I've been steadily losing weight over the last few months by making changes to my diet and going for 30-45 minute walks everyday. I recently bought an exercise bike, and although I enjoy cycling, I was told yesterday that it would bulk my legs up, which is not what I'm aiming to do. Can anyone confirm or deny this? If it helps, I use little resistance and usually cycle about 5kms at a speed of 20km an hour once a day. I'm pretty new to all of this, so noob-slaps are totally welcome.