[phnk]

> the heart rate data they have isn't very good

Not too many people seem to care on the reading end, so I guess that's fine.

As another user (kaustyap) posted further below:

> It kind of sounds like marketing pitch by fitbit to let potential clients in health industry know that they have so much of data to sell.

Sounds right to me -- it's a marketing ploy.

In an academic or industrial setting, the data might still be useful, but it would have to get re-crunched with many, many more controls, plus sample corrections, cross-validation against other data, etc. -- than what the linked article does.