Have you a fitness tracker? Or going to buy it, you must know about its working, functionality and other common features. A fitness tracker is a computer program that monitors physical activity and other activities related to health and fitness, such as the number of calories burned by a person, body temperature, etc.

There are many kinds of fitness trackers. For the working of wearable fitness trackers, it needs the physiological details of the person. It may include the gender, weight, and height of the person. A fitness tracker helps people in setting their fitness goals.

Features of a Fitness Tracker:

A fitness tracker is very beneficial in maintaining health and fitness. Here are some of the essential features of a fitness tracker:

  • To let you know the exact impact of your daily activities, many fitness trackers can monitor the number of calories you burn. Some of the exercise bands also have a tracking system for calorie consumption. It allows you to add the intake of food and calculate the calories consumed against the calorie intake.
  • A fitness tracker can also monitor a person’s heart rate. So it helps you to calculate your exercise’ intensity and adjust it according to your body capacity.
  • The fitness tracker’s sleep monitoring system helps you monitor the duration and quality of your sleep. It allows you to improve your general fitness and physical health.
  • The new fitness trackers also have a wireless system. It helps you to connect your tracker to other devices.
  • The wearable fitness trackers are adjustable, so to comfortably adjust on your wrist.
  • The fitness trackers are mostly waterproof, so if you are a swimmer or do other workouts, it can work properly.

Working of Fitness Tracker:

A fitness tracker works through various systems. It may use a GPS for tracking a person’s location or an accelerometer that can track a person’s movement.

1. GPS:

GPS stands for the global positioning system. GPS can determine a person’s exact location. It uses ‘triangulation.’ GPS helps track how many steps or how much a person is running.

GPS works using strong signals by the Global Navigation Satellite System network. It works by creating microwave signals transmitted to the GOS system to give information like location, time, or direction.

 So, in the same way, a fitness tracker has a GPS that helps locate the order or location. It also keeps a record of the past 12 hours.


A fitness tracker may also have a thermometer fixed in it. It is a fast, simple, and easy way to precisely measure the temperature during physical activities. It helps to monitor the temperature readings, get reminders, and sync it with other apps.

The wearable fitness trackers do not give a specific body temperature reading. It will provide a relative reading as the skin temperature on the wrist is different.


A fitness tracker may also have a skin response sensor. It is a kind of galvanic skin sensor. A galvanic skin response sensor can measure the electrical conductivity of the human’s skin by using electrodes.

 This kind of electrical conductivity is related to the changes in the moisture level of the skin. It happens during the exercise when sweat glands are more active.

When the sweat glands open up, the electrical conductivity changes, and it can be seen and monitored by a fitness tracker.


A fitness tracker can measure the number of calories you burn in a day. It uses your physiological information like age, weight, and gender. When doing challenging exercise or workout, you burn many calories that can be detected in your fitness tracker.

It measures calories using a person’s BMR.  Some fitness trackers can measure the calories only during exercise, while some can measure even when you are at rest. So keep this thing in mind while buying a fitness tracker.  


Most fitness trackers have light sensors in them. The main reason for having a light sensor is to alter the display’s brightness according to the surrounding light. The light sensor helps to save the battery life of a fitness tracker.

A light sensor tells your fitness tracker to dim or brighten its screen. It dulls the light at night and illuminates it in the sunlight.


Fitness trackers somewhat track the swimmers too. Several fitness trackers come with waterproof features.

When you are ready to swim, the first thing to do is turn on the companion app’s swim tracking mode. It will keep a record of the rate and efficiency of swimming. For this tracking activity, a fitness tracker is waterproof.


An accelerometer is included in the fitness tracker. It can measure the steps and the movement during activity. An accelerometer can calculate the movement in any direction, like upward or downward. It tracks the inclination, slit, and orientation of the body. So it is the most common and essential part of every fitness tracker.


A fitness tracker can also monitor sleep. It indicates how much sleep you get on average. The sleep tracking system in a fitness tracker cannot diagnose any sleep disorder. But, it can mean the number of tosses and turns during sleep.

In this way, you can take better sleep habits. Proper sleep can help you prevent many diseases.


The fitness trackers have a heart rate monitor system that may be of the optical type. This process is called photoplethysmography. It works in a way that an LED shines, and an optical sensor in the tracker monitors the light that bounces back.

As the blood can absorb more light, the light level’s alterations are translated into the heart rate. The accuracy of the heart rate monitoring may vary in different trackers. It depends on the quality and price of the tracker.


Summing up the entire discussion, we found that, A fitness tracker can help you to maintain your physical health. It has almost 16 different kinds of sensors in it. Some of the sensors in a fitness tracker are mentioned above. You can monitor location, the direction of movement, temperature, etc., with a fitness tracker’s help.

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