I don't agree with "If done at a proper relative intensity, everyone finds exercise extremely unpleasant in the moment.". It may be physically uncomfortable but

I don't agree with "If done at a proper relative intensity, everyone finds exercise extremely unpleasant in the moment.". It may be physically uncomfortable but you can get pleasure from taking control over yourself. It's hard for me to explain, but some unpleasant thing can bring pleasure. Alos, if it is extremely unpleasant I'd doubt it is done at the proper level.