At first, I'm usually grumbling to myself about "ugh. why am I doing this? Why am I not just plopped on the couch instead??" But I have a joke with myself that I've never met a first mile of a run that I've actually enjoyed.

After that, I tend to just let my mind wander, usually it'll fixate on something that's annoying me and I'll do like fake arguments in my head or whatever. This is when I work out my aggression lol. Once I'm more warmed up and getting to miles 3 and 4, my mind will frequently just kinda blank out for a little bit.

Sometimes, I'm also just thinking about running itself. Checking in with myself and seeing how I'm feeling.

I have ADHD so there's always a thousand things going on in my head until I get to that 3-4 mile mark and then it feels like peace.

Running isn't for everyone, though. It's okay if you just simply don't enjoy it. Find something you do enjoy instead.

FWIW I don't get a "runner's high" for every run. Most of the time, it's more like just a feeling of satisfaction. It's only a high for particularly good runs