Here: Do things when you aren't ready to do them.
Example. In the morning, I used to try to get myself 'ready' to get out of bed. Get all my little internal planets aligned. Guess what, it never happens. You'd think the solution would be to recognize that not being perfectly mentally prepared isn't a requirement to getting out of bed. Like being 1/2 ready is good enough or something, but I found it more effective to recognize the unreadiness. I do a quick stock take and confirm that I'm definitely not ready to get up and then I get out of bed. Anyone can get up when they want to but it takes a special kind of crazy to know that there's just no way you can do it and then do it.
Don't want to go to the gym? Just can't find the motivation? Good. Perfect conditions.