This really resonates with me. I think I have 2 kinds of meditations like this. 1 is more “centering” - fly fishing; and the other is more “processing” - gravel biking.
When I’m on a long, multi hour gravel bike ride - I usually don’t listen to music - just the sounds of world around me and let my mind freely wander. As my mind wanders it finds the tough emotional pieces I haven’t yet processed and starts chipping away at them. Sometimes I end up crying quite hard depending on what my mind has decided to work through. I’m sure I look like a maniac to whatever farmers I’m passing by.
Fly fishing on the other hand is less emotionally intense and much more calming. The dull roar of the river, the intense focus on the water - trying to spot the fish movements within it, trying to identify the tiny bug life around me so I can better select a fly, the focus on placing my fly and my line precisely where I want it. The rhythmic casting, mending, and recasting. Finding constant balance as you wade across uneven river beds. It’s a rare thing where I can fully silence my mind but it’s easy to do when fly fishing. It’s like a deep reprieve from the otherwise constant chatter of thinking - just calm and serene.