Why do you exercise?

I’ve gone from hating running to almost liking it and back to hating it again. I can’t name a single tangible fitness benefit I’ve gotten from it and have to force myself to go every time. Logically, I know it’s “good” for me, but it sure doesn’t feel like it lately. Reminding myself that it might increase BDNF just doesn’t seem to be cutting it anymore.

So why do you exercise? What keeps you going back? Have you quit and regretted it? Pushed through slumps and been glad you did? Or even quit and been glad you did?