Fitbit is an application that lets you keep a complete record of your physical activity as well as your eating habits and even your sleep schedule.
The best way to use the Fitbit application is to make its devices (for sale on its webpage) as well as to help you measure your physical activity throughout the day: the steps you take, the stairs you climb, the calories you burn, etc.
In addition to measuring your physical activity, Fitbit also helps you drink and keep records of food you eat. The app advises you to provide daily water for every day, so every time you have a glass you should add it to it. Fitbit also offers you a certain number of calories you will not have to go by at day, and lets you write food to eat
Fitbit, minimal, can be a central switchboard to keep your habits healthy, it lets you control everything about your health: athletic activity, eating habits, water consumption etc.