An activity tracker is on your wrist and visible throughout the day. It reminds you everyday of your activity level and helps you reach basic fitness goals.
For those with office jobs, or who are working from home, it can be an eye opener on the lack of activity. A person working at home can in theory wake up, shower, have breakfast, work, have dinner and go back to sleep with less than 40meters walked. Compare to the usually recommended daily 10,000 steps!
You can compete against yourself and try to reach the daily 10,000 steps by walking to the office. You can also compare with friends. Most activity trackers have leaderboards and entice you to compete on who has the most weekly steps. It’s not unheard of to walk late in the night or on a Sunday just to be finish in the leaderboard.