Sports electronics help you measure your sports performance. You not only gain insight into how you perform, but also analyze your performance. Sports watches are the most extensive and measure various data, such as your heart rate, speed, and route. Activity trackers mainly measure your daily activities, such as your steps and stairs. Don't want to measure lots of data, but only your heart rate? Choose a heart rate belt. If you regularly cycle, speed and cadence sensors are for you. They measure your speed and pedal revolutions per minute.