Unlike marathon or long run miles, they are fast enough to feel like work.
Unlike 5K or 10K miles, they are slow enough to feel interminable.
I want to slow down because waaaaaah, I'm tired.
I want to speed up because, dammit, I want the things DONE.
I want to rest less in between intervals because they're not too tiring & I'm impatient.
I want to rest more because I don't really want to start the next one.
I want to do them because I really, really want to improve my HM time.
I DON'T want to do them because of all the reasons I already said.