I agree with you about weightlifting and its meditative properties. I've also found that going against what you usually seen in a gym and NOT wearing headphone

I agree with you about weightlifting and its meditative properties. I've also found that going against what you usually seen in a gym and NOT wearing headphones actually helps even more. The background noise is just that, background noise, as opposed to a focused sound. I also rock climb, and I have found that it is possible to achieve the same state while bouldering or rope climbing, as long as the route is below skill level by a decent margin. I'll run the same bouldering route 4x and not even think about it, I just kind of "zone out" and let my body do the work.