See also: Fitness Trackers
A fitness tracker or activity tracker is an electronic device that measures and collects data about an individual's movements and physical responses in order to monitor and improve the individual's health, fitness, or psychological wellness over time.
Many fitness trackers are similar to pedometers, but in addition to counting steps they contain additional sensors such as accelerometers and altimeters to collect or estimate fitness and exercise information, including the speed and distance travelled, heart rate, calorie expenditure, or the duration and quality of sleep.
Improvements in computing technology since the 1980s, driven by the rapid advancement of smartphones, paved the way for wearable tracker devices with integrated sensors. Frequently data such as fitness, mood, sleep, water intake, medicine usage, sexual activity, menstruation, and potential illnesses is synced with mobile apps. This has led to privacy concerns regarding how consumer information is stored and analyzed by the companies involved.