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.
In addition to other tips already mentioned, I’ve found it’s easiest for me to muster willpower to do chores/tasks first thing in the morning. That way I get stuff done before I get distracted and/or lose willpower. Also it’s sort of cheating because I’m not fully awake yet.