When she was a kitten I used to take her out on a leash too, to practice. I guess that's why she's comfortable with it now. And when she grew up she went out for hours and hours.
We moved to another apartment on a busy street last year and we don't have a garden or balcony, so for her it was a major adjustment. I had to try something..
She loves going to the park.
Never expected her to like the bike rides though! :-D