The first exercise that comes to mind is push-ups but I've never been able to find this or similar exercises enjoyable or meditative--especially if I'm doing them inside.
Here-in lies the rub. Working out is neither of these things unless you have some steady progress with it, and thus a real motivation. Motivation will then drive the 'zone' type meditative feeling and so forth.
Kinda like that smile until you feel happy, type of thing.
Most of the basic exercises have been covered, but generally weights are better IMO, as is going somewhere
like its a job/office/duty etc...
Whether this means an outside at a jungle gym, or some meat-head gym, to stay on task and focused, is a personal thing but a pretty necessary part. Sitting around your house watching an Intensity video or trying to make a commitment to do push-ups, or waiting for a nice day to climb trees isn't exactly going to get you to what I mentioned in the first point, which is why a lot of the 'all natural' workouts are probably a passing fad for all but the most committed folks.
I like weights, and machines. I do some BW stuff still tho. I'm up to 10 consecutive one-arm pullups with my little doggie hanging out in a backpack. I find working out both satisfying and fun, much more so than when I started.