Why the Apple Watch's 20-minute calibration test is worth your time - especially if you're data curious

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ZDNET's key takeaways 

• Your Apple Watch workout data might not be accurate.
• Calibrating your watch improves accuracy. 
• Here's how and why you should calibrate.

People wear smartwatches, such as the Apple Watch, to get iPhone-like functions on their wrists and to stay on top of their exercise and sleep data. By recording workouts or tracking daily activity with a smartwatch, you can get a clearer picture of your movement patterns and a more detailed idea of how many calories you're burning each day. 

The device can accurately measure a wide range of activity metrics, including pace, heart rate, calories burned, distance covered, and more. I regularly use the watch as I weight train, run, walk, cycle, practice yoga, and dance to monitor my heart rate zones and my exertion levels, and recover well before ...