Never tried it myself, but this Gracie interview (7:30-8:32) makes it sound as if Brazilian Jiu-Jitsu (at least with enough skill) could be high-adrenaline meditative:
https://www.youtube.com/watch?v=LdRIBYw6kNQ&t=450s
(also 9:00-9:15. I believe what's happening here is that Gracie calls the end result, but he has multiple paths to get there; the interviewee defends against one path, and Gracie, like water, just "flows with the go" along another path)