Unfortunately in the US, the lack of good health insurance options in spite of Affordable Care Act (ACA) means that even after paying the penalty for opting out of soul-crushing health tracking, it is probably still cheaper to work for a company for a company-subsidized health plan than to pay for it all oneself :(.
For mine, participation entails a yearly health screening.
The screening measures blood pressure, BMI, nicotine usage, and cholesterol (via a blood draw).
Depending on the findings, you fall into 1 of 3 tiers, which results in a penalty on every pay check if you don't fall into the numbers.
I know someone who works for Blizzard; if they wear a Fitbit and meet the goal set on it, they get a healthcare discount or a small cash kickback, I forget which.