I just picked up running after many years, ok a decade or more, and am amazed at what my body can do.
I hesitated for a long time thinking I couldn't handle it, or that I was too old to restart (57 this year).
But I had to call bullshit on myself, stop making excuses and just do it. (Okay, I did buy some new Nikes.)
Anyway, as I push myself along there are many moments of self-doubt and defeatist self-talk, especially on an upgrade. "I should stop". "My body can't handle this". Ecetera. When I look down and focus on just the road at my feet and and take one step at a time (pardon all the cliches), I find joy and satisfaction as I actually reach my goal!!
Exercise as a metaphor.
Have a great day!