Managing our habits is one of the trickiest things to do. Gretchen Rubin uses the Strategy of Convenience to make it easier to stick to new habits.
We're always looking for the most convenient ways to do things, which is often the source of our bad habits. For example, fast food is convenient, and going to the gym is a pain. Rubin says that she strategically flips the level of convenience to manipulate how easy it is to build the habits she wants.
You should identify the source of weakness for the habit you're having trouble with. If you hate grocery shopping, get groceries delivered or otherwise eliminate the inconvenience. Similarly, try to make your bad habits more difficult. Next time you're planning to move, move to a location where fast food isn't a convenient trip down the street but the supermarket and gym are.
Rubin explains it all in the video above, and the method is applicable to just about every habit you can think of.
Video: For Habits, the Strategy of Convenience. [The Happiness Project]