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.
Quite honestly the biggest game changer for me was understanding that you don’t have to feel like doing something in order to do it.
Force yourself to do it for five minutes, and 99% of the time you get in the groove and realise “Oh, this actually isn’t so bad” and before you know it, you’re done.
Every day I exercise (walking) and every single time it goes like this: