I dunno man.

I have never felt what people describe endorphin rush to feel like. Or runners high or anything remotely like it.

I'm almost 40. I had a pretty physically active childhood through my 20s, and I just never remember ever feeling good afterwards. It's very important for me to keep exercising to avoid diabetes, but I struggle mightily to make myself keep doing it nowadays because it is miserable to me

No one can really explain that to me. A lot of "maybe it's this, maybe it's that" but no help fixing it so I can motivate myself to keep doing the work

It sucks. I have a lot more empathy for the "I just can't make myself do it" crowd than I used to. There's a missing circuit in my brain or something and there's no brain mechanic to fix it.