How does Garmin stress tracking work?

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Tags

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2. #nervous
3. #possible
4. #physiological
5. #phenomenon
6. #system
7. #activity
8. #autonomic
9. #insight
10. #reflecting
11. #actually
12. #between
13. #digest
14. #cycles
15. #stress
16. #fight
17. #states
18. #makes
19. #variability
20. #heart
21. #remarkable
22. #watch