Actually I've found that for my mind at least this works. Do the sort of motivational tricks that your mom/dad/teacher used on you 20 years ago. At this point we go get icecream. At this point we stop for a game. At this point we go for a bike ride. If you get here you get a small lego toy. If you get at X we go to that restaurant ...

I am fully aware of the trick and I could just choose right now to violate the thing entirely. It still works.

I don't suppose that counts as tricking your mind into thinking something is interesting. Still works.