How to know if a digital fitness monitor is worth the money

Digital fitness monitors (DFMs) are great tools to track exercise and diet progress. They come in wearable styles such as wristbands, watches, and pendants, as well as hand-held pieces that can be clipped on a sleeve or slip into a pocket. DFM features may be simple—tracking the amount of steps taken or calories burned—or they more sophisticated, with sensors that capture heart rate, perspiration, skin temperature, and sleep patterns. DFM prices increase with the amount of bells and whistles available. The majority are in the $50–$200 range.

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