The first fitness tracker was invented in 1983 by Dr. James Fries, a Stanford University professor of medicine.

The BodyMedia Fit was the first fitness tracker to be commercially available, and it was released in 1983.

The first fitness trackers were able to measure steps taken, calories burned, and heart rate.

Fitness trackers started to become popular in the early 2010s, thanks to the release of the Fitbit and the Nike FuelBand.

The Fitbit is the most popular fitness tracker today, with over 100 million active users.

Fitness trackers can help you track your activity levels, set and achieve fitness goals, and monitor your sleep.

Fitness trackers can be expensive, inaccurate, and addictive.

Fitness trackers are likely to become more integrated with other devices, more personalized, and more affordable in the future.

The Garmin Forerunner 205 was the first fitness tracker to offer GPS tracking, which allowed users to track their distance, pace, and route.

The Polar RS800CX was the first fitness tracker to offer heart rate monitoring, which allowed users to track their heart rate during exercise.

The Jawbone UP24 was the first fitness tracker to offer sleep tracking, which allowed users to track their sleep patterns and quality.

The Pebble was the first fitness tracker to offer smartphone notifications, which allowed users to receive text messages, emails, and other notifications on their wrist.

The Fitbit Charge 2 was the first fitness tracker to offer contactless payments, which allowed users to make purchases using their wristband.

The Apple Watch was the first fitness tracker to offer music storage and playback, which allowed users to store and listen to music on their wristband.

The Apple Watch Series 3 was the first fitness tracker to offer built-in GPS and cellular connectivity, which allowed users to make calls, send texts, and use data without their smartphone.