It's cool and I like it, but it feels that the form factor is wrong. I would assume you would already wear something on your wrist(aka activity tracker), changing wristbands for activities does not sound like a good experience.
For tennis, I would rather clip something small on the racket that would sit there all the time.
I agree on the form factor. However I can imagine they went for this approach due to the data you could gather from the movement of your wrist. Just an assumption.
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Hi all, thanks for the comments, really appreciate it! We did indeed go for the wrist approach due to it's importance in understanding technique. The form factor is driven by the goal of creating meaningful insights from the data...needs a lot of processing power and a relatively large battery. Hope that's useful!