i doubt if you can leash a cat for a walk, though that's possible. we have a himalayan persian cat that is too fat and furry so we just keep him indoors 24/7. he does take a peek at the door step in the morning when i pick up the papers
and also you should be aware that keeping your cat loose on the outside could result in getting a fight with street cats, or worse could be shot with pellets from the asshole psycho