Ask HN: A fitness or health wearable for which I own the data?

I'm interested in purchasing a fitness or health tracking wearable. Some nice to have features include:

- Step tracking

- Distance tracking

- Sleep tracking

- Heart rate monitoring

- Different modes - walk/run/cycle

- Other smartphone linked alerts

While there are plenty of devices available which do some or all of the above, I have two further requirements:

1. If a linked smartphone app is required, it needs to be Android and I want to download the app directly from the manufacturer's website, not via Google's App Store. I'm running a Cyanogenmod ROM without any Google Play services, with no intention of installing any.

2. Data is not automatically sent to the manufacturer and is exportable from the device directly to my home, Linux, computer. Exporting a GPX file, for example, is fine. Basically, I want my own data, under my control, to analyse as I see fit, and not stored with a third party I have no control over.