If they're participating in the health care exchanges, they have a very limited set of criteria they can use to set pricing on the exchange (I believe it's just age and smoking status; sex is now a prohibited criteria, as are pre-existing conditions). I don't know if employer based healthcare can charge differential pricing based on whatever.
AFAIK, the fitness programs were based around many large employers running their healthcare insurance on a self-insured basis (often with an insurance company handling adminstration of the plan), and there's an expectation that increased fitness will decrease costs. Since the employer is paying the actual costs, decreasing them shows up in the bottom line; and incentivizing employees to do the fitness program might make sense. OTOH, some sort of requirement to wear a device to set an employee's healthcare premium sounds invasive, but I dunno.
AFAIK, the fitness programs were based around many large employers running their healthcare insurance on a self-insured basis (often with an insurance company handling adminstration of the plan), and there's an expectation that increased fitness will decrease costs. Since the employer is paying the actual costs, decreasing them shows up in the bottom line; and incentivizing employees to do the fitness program might make sense. OTOH, some sort of requirement to wear a device to set an employee's healthcare premium sounds invasive, but I dunno.