I've used high intensity cardio to manage pretty much any mental health issues I've flirted with over the years. (for me, mostly issues with focus, anxiety).

I am almost 40 now and I do see it seems to be diminishing in terms of effectiveness. I've tried to vary the amount and intensity but that has had limited impact.

I find now I need to manage other factors: alcohol intake, my diet, socialization, sleep, news consumption are all big ones for me.

I think there is a reason people do simplify many aspects of their lives as they get older. The sharp tools of youth aren't quite the magic they used to be.

Apps like Headspace, or just meditation generally, is something I have tried and I can see the benefit. I try to "clear my head" twice a day. Usually that's a 20 minute nap, and I've been trying to find another option and meditation seems like a good one.