The natural tendency of life is to find stability. In biology we refer to this process as equilibrium or homeostasis.
For example, consider your blood pressure. When it dips too low, your heart rate speeds up and nudges your blood pressure back into a healthy range. When it rises too high, your kidneys reduce the amount of fluid in the body by flushing out urine. All the while, your blood vessels help maintain the balance by contracting or expanding as needed.
The human body employs hundreds of feedback loops to keep your blood pressure, body temperature, glucose levels, calcium levels, and many other processes at a stable equilibrium.
In his book, Mastery, martial arts master George Leonard points out that our daily lives also develop their own levels of homeostasis. We fall into patterns for how often we do (or don't) exercise, how often we do (or don't) clean the dishes, how often we do (or don't) call our parents, and everything else in between. Over time, each of us settles into our own version of equilibrium.
Like your body, there are many forces and feedback loops that moderate the particular equilibrium of your habits. Your daily routines are governed by the delicate balance between your environment, your genetic potential, your tracking methods, and many other forces. As time goes on, this equilibrium becomes so normal that it becomes invisible. All of these forces are interacting each day, but we rarely notice how they shape our behaviors.
That is, until we try to make a change.