 The indoor lifestyle is safer, but it's pretty monotonous. Grace Carter is a cat veterinarian. She says a walk on a leash can alleviate the tedium while also providing a measure of security. I think for the right cat, it can certainly create environmental enrichment, get them some more exercise and things like that. But Carter says it's not for everyone. Some cats are just too stressed for it. Some never adapt to the harness and leash.