@porcelainrose Hope this post stays up because it's very relatable!
I'm not sure I have the same 'other' stressors in my life that you do, but what you said about working out because it becomes your identity (paraphrasing) resonates with me. Similarly I'm use to training 5/6 days a week according to a fairly fixed plan (sport-specific) for a sport where numbers and results matter.
With Covid, the fun part of the sport i do is out, so I'm trying to work out whether the same level of training is something I want/need to change and see if I can be comfortable with reducing exercise without feeling guilty, bored, lazy, etc!
Most days I can comfortably say to myself, "OK I ~want~ to do this run/weights/bike session" but its those other days when the thought process is, "I don't really feel like working out, but if I don't do something I'll feel worse..." that I'd like to work on.
Having said all that, there are other things that I find relaxing and I think you just have to find those that fit your personality type. For me it's cooking and reading plus long walks with a podcast. I've tried meditation/yoga - it's not for me personally, but works for many. My mind needs to be engaged/occupied.
I think if you're used to following a plan and seeing progress then you might also appreciate a hobby or challenge that you progress at over time.