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Fact #1. There are three basic components to a fitness tracker. First is the accelerometer. They measure orientation and acceleration. They're found in everything from iPhones to Wii controllers. The second is the altimeter. It measures altitude. The tracker assumes a certain height is equal to a stair step. That's how it knows how much you've climbed. Then there's the heart rate monitor. It shines a light into your wrist. This lights up your blood. The changes in light correspond to changes in heart rate.
Fact #2. It's important to know what kind of exercise you'll be doing. Not all fitness trackers are made for swimming, for instance. Tracking kickboxing requires two trackers, one on each arm. Marathons or triathlons will need solid GPS data to track long training runs.
Fact #3. You'll also need to assess your level of vanity. You might feel self-conscious wearing something that resembles a calculator watch from the 80s. It's important to be honest with yourself. Because unless you wear your fitness tracker every day, it's nothing but an expensive paperweight. If you don't find something you like, you can opt for something that fits in a pocket. But you should also make sure that you won't forget it when you do your laundry.
Fact #4. Fitness trackers are old. Pedometers, for instance, date back to Leonardo da Vinci. At that point, it was just a pendulum that with swing with your steps. Even Thomas Jefferson had one. He sent instructions to James Madison for how to set it up.
Fact #5. Ten thousand steps is almost always assumed to be your goal. But that didn't come out of any massive study. It was simply the invention of a fitness tracker. A Japanese businessman sold a pedometer that aimed for that goal in 1965. And for some reason, it stuck.