However, the benefits of habits come at a cost. At first, each repetition develops fluency, speed, and skill. But then, as a habit becomes automatic, you become less sensitive to feedback. You fall into mindless repetition. It becomes easier to let mistakes slide. When you can do it “good enough” on autopilot, you stop thinking about how to do it better. The upside of habits is that we can do things without thinking. The downside of habits is that you get used to doing things a certain way and stop paying attention to little errors. You assume you’re getting better because you’re gaining experience. In reality, you are merely reinforcing your current habits—not improving them. In fact, some research has shown that once a skill has been mastered there is usually a slight decline in performance over time.