I actually used to really hate exercising. I did it because it was a “good” thing to do but I never really enjoyed it.
Now, though, I really truly enjoy it. I look forward to walking and (when I get the chance) running. There is no dread or “ugh god I don’t want to do this.” It’s excitement. I’m not sure when that changed for me, but exercise is definitely the highlight of my day now.
Maybe that just means the rest of my life has lost meaning, who knows.