MIT Technology Review:

For several years now, Apple has operated a hush-hush fitness lab in an undisclosed location at its campus in Cupertino, California, and this week the company offered up a few details about how it’s studying all kinds of activities—on dry land and in water—in order to build algorithms for tracking them on the Apple Watch.

Jay Blahnik, Apple’s director of fitness for health technologies, said Tuesday that Apple believes the gym-like lab—which was built before the Apple Watch was released in 2015 and uses employee volunteers as guinea pigs—has now collected more biometric data than anyone else.

This is an all too short article. I’d love to read more about what Apple is doing in the gym and how. Unlikely, I know.