Can someone tell me what "hunter movement" means?
It refers to the way in which the horse/pony naturally moves. Yes, Hunters (in general) are going to look like moving is easy to them, smooth, floating, effortless.
Some horses have just got **it**. Some do not.
For a short period, I rode a horse named Romeo. I was getting him tuned up for my aunt so she could sell him. My English trainer actually referred a client who ended up buying him, but my trainer came out and rode him first to test him out. She commented (and I agree) that he had all the different gaits for dressage. He moved gracefully and had the different extensions of gaits that you would need. He just looked PRETTY when he moved. Nothing to do with my training on him, or any prior training; it's just how he naturally moved. I noticed he was also very aware of his feet. From day one when I started taking him over logs and crossrails, he NEVER knicked one with his feet.
And then compare that to my Red. My clunky, short-strided, beefy QH, LOL. I love him to death but NOT graceful!! Often trips over ground poles and logs, LOL. And not aware of his feet like Romeo was.
It's interesting because I don't feel like he particularly covers a lot of ground, what with his short little pony legs.
Covering ground will be relative to size. So obviously if he is a pony he is not going to cover the ground that a 16.3 hand warmblood will -- but relative to his size!!