When I go out for a run, I usually run, as in I go fast or fast-ish.
I should probably have a go at some proper training, but mostly I just run as fast as I can maintain. But the other day I was pretty bagged, thoroughly tired. So I went for a trot, a gentle little jog along, not trying to do anything, just trotting along.
This is not exactly a revelation for anyone at any level...but it was a wild change. It was so easy.
Not something I want to do all the time, but it was relaxing, and it was amazing that I could go on for a long time without even breathing very hard.