Since fitbit came out in 2009, fitness bands and trackers have become really popular.
Benefits of fitness trackers
Measure progress towards fitness goals
It is very easy to measure and track your fitness progress when you see them in form of numbers. You can easily track your fitness goals and improve them. The numbers further motivate you to achieve better goals.
Since a fitness tracker shows you what is your heartbeat,you can make effective decisions about the range you want to train in. You can relax if your heartbeat is over the limit where you wnat it to be. This can help you train better