The Fitness Tracker

A fitness tracker is a small device you wear on your wrist like a watch. It counts your steps, measures your heart rate, and tracks how much you move. It helps people stay active and healthy.

How Fitness Trackers Work

Fitness trackers have tiny sensors inside them. One sensor called an accelerometer detects motion and counts your steps. Another sensor can measure your heart rate by shining a light on your skin.

The tracker sends all this data to an app on your phone. You can see how many steps you took, how far you walked, and how well you slept. Some trackers remind you to stand up and move if you have been sitting too long.

Fitness Trackers Today

Fitness trackers have become very popular since about 2010. Fitbit was one of the first popular brands. Now many companies make them, including Apple, Samsung, and Garmin.

Some fitness trackers look just like regular watches. They can show the time, display messages, and even play music. Many kids wear them to try to reach 10,000 steps a day.

Fun Facts

• The goal of 10,000 steps a day started as a marketing idea in Japan in the 1960s.
• Some fitness trackers can tell if you are stressed by measuring your skin.
• Fitness trackers have helped doctors discover heart problems in some patients.

Did You Know?

The first simple step counter, called a pedometer, was invented over 200 years ago by Thomas Jefferson's time.