Whether it be to do your job, get your schoolwork done, clean your house, work on your creative passion, etc.
Bonus points if you’re someone without reasonable self-control so saying something like “I can only have a cookie after I do this/while I do this” doesn’t work for you and you’re just going to eat the cookie and not do it.
I just think about how much worse I would feel later with this damn thing hanging over me. Alternately, I think back to how good I felt last time I actually got something done.