Adidas Fit Smart vs Fitbit Charge

Wearing it continuously, you can expect around 5 days of use. If you only wear it during workouts, it will last closer to a full week. The charger is proprietary, and you simply place the Fit Smart fitness tracker on it and line up the pins.

You can set weekly goals and training plans through the fitness tracker's app. One downfall is that if you have a training plan set in the app, you can't also have weekly goals. Once you have a plan selected, it will sync with your phone so you don't forget when you wanted to workout.

You can also access previous workouts and achievements from the app, along with estimated times for 5k, 10k, half, and full marathon races based on your past running performances.

There are 3 buttons on-board. The first toggles between battery status, time, and the different training modes. The other two take you through MiCoach and free training modes. These buttons are easy to find, even with gloves on.

During workouts, the LED lights on the side change color to show how intense your workout is. White (74bpm) is none-light activity, Blue is warm up/cool down, green is calorie burn and boost endurance, yellow is intense training and muscle burn, red (182bpm) is short power bursts to develop strength and speed.

If you have a MiCouch workout selected, on-screen you will see an up or down arrow indicating whether you should pick up the pace or slack it off.

Users can see their friends' activity, compete one-on-one, and earn badges.

The battery is rated for 7 days, and has been tested up to 9 days by reviewers.

In addition to fitness metrics, a Fitbit Charge synced with a phone will display time and caller ID.

The Charge tracks sleep cycles, and its alarm can be configured to take this into account, attempting to select an optimal wake time.