As latest updates with many wearble watches on the market, while playing tennis they can count how many forehand backhands you placed, your stroke speeds and spin and so on. As far as I know Fitbit charge 2 shall have same sensors with most of the products. Can you add extra detailed features to view for tennis, like forehand number speed and so on. I saw Samsung gear s3 has such an app even, it will be great for Fitbit
Moderator edit: Subject for clarity
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