Walking Cat. Help?

Brief：
I have a cat that loves to go out side he is like 3 years old and he loves the outside.but i have to put a leash and harness on him or else he will es.. 

I have a cat that loves to go out side he is like 3 years old and he loves the outside.but i have to put a leash and harness on him or else he will escape but sometimes when we go to walk he just acts like he is tired and tips over wich i know he is not injured or tired because i dont put it tight and he usually sleeps alot.so i need some tips and ways on how for him to get used to a leash and harness.helppp.

Lots of cats lay down and refuse to move when they have a harness on. Just sit there with him and wait, and move with him when he wants to move.

Even when cats are used to a harness and leash, they very rarely trot along at your side like a dog. Instead, they choose to roll around in the dirt/grass, sit in one spot and take in the sights and sounds, or just lay out in the sun. They aren't dogs - your expectations might be the problem here and not the cat.

BTW - not saying that to be rude at all. It's just that it's been my experience that many "problems" people have with their pets turn out to not be any kind of problem at all, but rather unrealistic expectations of the animal's behavior on the part of the owner. Haha cats are brilliant, aren't they? Faking illness to get their way?

Just keep doing it. He will either adjust or he won't...it's really up to him at this point, since you aren't doing anything wrong (and are actually being awesome by not letting him run around outside by himself).