I'll bring an example: there are people who love to dance and could do it for hours. Yet, if you'd make them run a long distance they would get tired really soon just because they don't like running not because they wouldn't have the stamina. On the other hand there are people who love long distance running and could run for hours yet if they are forced to dance they get easily tired.
Both activities are physical so while doing either of them, our brain releases endorphins, which make us feel good. However it seems that just our emotion toward the activity we are doing defines whether we actually feel good.
So my question is: Is there any difference in brain activity while doing something you love or doing something similar you don't like?
If our emotions do affect our brain activity significantly, would it be possible to psychologically train ourselves to like/dislike a certain activity we want to do more/less?