Walks out nicely?

Hey! Can someone Tell me exactly what it means to have a horse that "walks out" nicely on the trails?

That phrase, to me, means that the horse has a good ground covering walk. He reaches well under himself , engaging his hindend, and moves well. Not hurriedly, but nice "ground eating" walk.

Exactly. A horse that travels well walks at a nice brisk pace all day long and doesn't require alot of leg to keep going.

I agree with the two above definitions. I also think of it as a very confident walk which demonstrates that the horse is relaxed in it's environment and feels that there is nothing to be wary of.