It’s easy to see how Fitbit, Garmin, Polar, and other fitness watches can be useful companions when tracking exercises like running or cycling. During repetitive endurance exercise, fitness trackers and smartwatches are able to monitor the pace and speed at which you move, combining it with your heart rate, oxygen levels, and the difficulty of your route to provide a great snapshot-by-numbers of how your workout went. But yoga is a little more difficult.
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