For me, it NEVER gets fun. I've been fit. REALLY fit. And it always sucked.
Runner's high? GTFO.
The pump after lifting? GTFO
Never once after a workout have I said, "Oh, I feel great!"
It sucks. I hate it. I have to put in way more effort than most to get mediocre results.
I suppose it's better than dying, even if doing it could kill me anyway. 😝