[We asked an expert] How can you walk without getting tired and improve your endurance using the PRO TREK Smart WSD-F21HR, which can measure your heart rate?
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![[We asked an expert] How can you walk without getting tired and improve your endurance using the PRO TREK Smart WSD-F21HR, which can measure your heart rate?](https://outdoorgearzine.com/wp-content/uploads/wsdf21hr_2_catch.jpg "[We asked an expert] How can you walk without getting tired and improve your endurance using the PRO TREK Smart WSD-F21HR, which can measure your heart rate?")
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