So we all breathe, inhale and exhale. That is the nature, intake and dispelling of air. How that is accomplished, if done consciously enough, becomes the habit. This is where you see some people breathe in and their shoulders raise up. Now, thee is nothing wrong with these habits because the goal is still achieved and the person is still alive. But what happens when the habit effects the nature? "My habit is hindering me from breathing efficiently." Now this is just an example, and I'm not sure if this is a true thing that has happened, but we can relate it to mostly anything.
My habit of using my back too much when lifting things causes my back problems. If we notice our habits, we can relearn and make new ones from the simple, efficient, natural state of where the habit stemmed from. We have the power to change in the search and cultivation of our self.