Just as a question, what makes long walks in the woods or long runs not "actual meditation"? I guess my question can also be phrased as, what do you think meditation is?
I'd argue that meditation is more about approach and frame of mind than activity -- and there certainly are moving forms of meditation. There's also just a lot of kinds of meditation, from a lot of widely different traditions, so you're not going to find unified literature. (There's also a few major world religions that feature meditation as a component, so you'll find a lot of the literature tied up with that worldview, as well.)
That's what prompts my question above: if you don't have some goal or idea in mind, it's sort of hard to direct you to particular resources.
The place I suggest starting for everyone is find somewhere in your life that you're meditating without knowing it, and try to do that somewhere else. Sports, crafts, etc. Can you intentionally make an activity feel like a long walk in the woods or a good run? like losing yourself in being focused on a hobby?
...can you feel that when just sitting there?
At some level, that's all meditation really is.