Predictability.

How to prevent someone from mapping out your Pattern of Life (PoL).

With adequate time dedicated to observation, the vast majority of humans are incredibly predictable. With this in mind, analyze your own daily schedule and try to see yourself from the outside. You probably work the same hours, on the same days of the week, getting to and from work via the same route.

Mix it up.

Shake off potential outside observation by switching up your schedule. Don't take the same route to work every day, add some slight variation to there is no guarantee of your location at a specific time. If your career allows it, leave for work earlier some days and later on others, instead of leaving the house at 08:15 on the dot every weekday.