The latest report on the health- and fitness-tracker market shows that it may achieve a valuation of as much as US$5 billion by 2025. This may be driven by the increasing number of applications and functions for these devices. They may in fact improve to the point that they can be used to help diagnose and prevent illnesses in the future.
https://www.notebookcheck.net/The-fitness-tracker-market-may-reach-US-5-billion-in-5-years.451275.0.html