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Pretty sure that was SwingVision, an app based on real-time video analysis of your swing, rather than the hardware on your watch. The watch is just a screen to

• gnicholas 5y ago
  That would seem much more plausible! If that's the case, I wasn't the only person who was fooled; Ars Technica is reporting that: > the Series 7 can measure users' tennis serve speed or the distance of a golf drive, and "Hey Siri" prompts can tell users how far they've biked. https://arstechnica.com/gadgets/2021/09/the-apple-watch-gets-a-visual-makeover-with-the-series-7/ https://arstechnica.com/gadgets/2021/09/the-apple-watch-gets...