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How Wearable Fitness Trackers Work: Smart Watches to Fitness Rings

Fitness trackers were first invented in 1965 by Dr. Yoshiro Hatano, while he was researching ways to combat obesity. He proposed that walking 10,000 steps a day would provide the correct balance of caloric intake and activity-based calorie expenditure to maintain a healthy bodyweight. Fitness trackers still tend to use 10,000 steps as a benchmark today. So, let’s get into the nitty gritty of how fitness trackers actually work and how accurate they are. How are steps measured? A fitness tracker senses the movement of the body on a 3-axis accelerometer which tracks movement in every direction. Some trackers also come with a gyroscope to measure orientation and rotation, which is helpful in accounting for more complex motions. The altimeter...

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