I've trained cats to walk on a leash. They hated it. Cpt January was the first. In the beginning, he would like down dead and refuse to move. The other, Puddy, would do the same. Eventually, they got used to it and whenever I would jingle the leash, they were eager to go out. I had told them if they didn't cooperate, they would never go outside.
Recently, I changed my approach. I found this backpack/stroller on Chewey for carrying/transporting your pets. It is the coolest thing. I really needed to get more exercise myself and this was a good excuse. I stuff the furbaby in the container and go out on the property for a stroll.
Of course, they are new to it and sit inside crying. I know they will get used to it. These two furbabies of mine have never been outside. It is time! And I am not just sitting in my corner at the computer. I have joined the pet walkers!!!!