A fitness band, also known as an activity tracker, is a device for monitoring and tracking fitness-related metrics such as distance walked or run, calorie consumption, and in some cases heartbeat and quality of sleep. It is a type of wearable computer that is worn on your arm in the same way as a bracelet. The term is now primarily used for smart bands that are synced, in many cases via Bluetooth wireless technology to your mobile phone for long-term data tracking. There is also independent mobile that also can use this information to display a record of your progress. Some evidence has found that the use of these type of devices results in less weight loss and better genual health.
Having the ability to keep an eye on how your fitness is doing assists you in changing habits that might not be good for you, for instance, the passive reminder on most smart bands that remind you to get up and walk around when you have been stuck at your desk at work.