What are some alternatives to Fitbit products?

People use Fitbit for different reasons:

0. Counting steps.

1. Tracking "real" exercise.

2. Tracking sleep hours and patterns.

3. As a tiny device that wakes you up without waking up everybody else around (this is my case, Flex 2 is the tiniest wake-me-up device I could find).

4. Tracking heart rate.

5. Tracking other biometrics I'm unaware of.

What products could people move to if they don't want Google to be aware of their data?