Millions of Americans are embracing health and fitness tracking devices — such as Fitbit and the new Apple Watch — to boost their health and wellness. But a new study suggests a potential downside of the new med-tech devices: Employers may begin to require them for some workers to hold down rising healthcare costs. MarketWatch reports that millions of the devices are expected to be introduced into the workplace by 2018 as employers adopt incentivized wellness programs to tackle rising health care costs, according to a study by Verizon Enterprise Solutions. “Tracker information will become part of your health record,”...