If you haven't tried it yet and are curious why people are so devoted to a form of exercise, "religiously" devoted, perhaps zealous...and if that perplexes you, read on.
If you have fitness and/or weight-loss goals, you might consider hiring a personal trainer who will help you choose the right diet and exercise plan, and also hold you accountable and motivated.
One of the most common resolutions made each year revolves around losing weight or getting in shape. To help achieve these goals, a fitness tracker is the best option.