Pixel and Kato are leash trained. Kato took it well, but Pixel is the jumper, and really bolts like lightning.
Kato needs the leash because he is completely fearless around cars.
They have a cat wheel and 6ft cat tree to play on...and the walks help too.
We take walks in the morning and evening...one at a time. I've tried to establish 'group walks' but they still go off in different directions. ;-) Also, Pixel is easily spooked; car doors slamming, big truck noises and such just send him into full afterburner runs ... but the walks have shown him where his home is, so he goes straight for "his" door.
Both cats are 'chipped'. Pixel went awol at one point, and the chip allowed him to be recovered. Highly recommended.
The key to leash training is to start inside. Let 'em play with the leash and harness first, before trying to put them on. This allows them to put their markers on the new toys...
Harness only, at first. There will be struggles...and once in place, they may fall over, lie down or stagger around, off balance until they get used to the feel. Once used to the harness, add the leash, inside, and follow them around to let them feel the differences.
Once they are okay with the leash & harness, venture outside during a quiet time...
The goal is to establish that the harness and leash are the only way they can go out.
Harness and leash in place first, then go out and bounce around.
Remember that they generally will NOT walk like a dog..Spartacus will lead, starting and stopping as he wishes, and probably not in a straight line. ;-)
Enjoy!