> Exercise doesn't always work like this. Yes you'll have bad days, but you'll find yourself more energised most of the time and mentally more at peace.

Is there anything that will convince you this isn't true for all (perhaps not even most) people?

The right type of exercise matters. I've often gone on bouts of cardio on a treadmill for months at a time (multiple times a week - at least 30 minutes each session). It never ceased to suck.

I can do a hike and never feel bad. But a treadmill or cycling device? Always feels bad. I hope it benefits me in the long run, because it definitely reduces the quality of life on days I do it.

My only real hope is to find some other kind of cardio that doesn't annoy as much.