Recently, it seems habits are everywhere. A slew of new books, not to mention countless blog posts and apps, guarantee a whole new you by harnessing the power of habits. However, almost all of these well intentioned authors promise too much. Many over-prescribe habits as a solution to problems they just can’t fix.

So what are habits, really? According to Dr. Benjamin Gardner, a psychologist focusing on habit research at King’s College London, “habit works by generating an impulse to do a behavior with little or no conscious thought.” Habits are simply how the brain learns to do things without deliberation. These impulses can be put to good use, but only certain behaviors can become habits.

Building a habit is relatively simple — just harness the impulse. For new habits to take hold, provide a clear trigger, make the behavior easy to do, and ensure it occurs frequently. For example, by completely removing unhealthy food from my home and eating the same thing every morning, my diet became a healthy habit. I extracted the decision making process out of what I eat at home.

However, if the behavior requires a high degree of intentionality, effort, or deliberation, it is not a habit. Although proponents of habits tout them as miracle cures for doing things we’d rather not do, I’m sorry to say that’s snake oil. All sorts of tasks aren’t habits and never will be. By definition, doing things that are effortful aren’t habits.

Unfortunately, this means behaviors that require hard work and deliberate practice aren’t good candidates for habit-formation. For example, although I make time for it every day, writing is not a habit. Writing is hard work. If I waited for an “impulse” to write, I’d never do it. To get better at writing requires concentration and directed effort to make sense of the words as they go from the research to my head and then to the screen. Similarly, lifting weights isn’t a habit because getting stronger requires working harder.