(Bloomberg) -- To fight rising medical costs, oil company BP Plc last year offered Cory Slagle -- a 260-pound former football lineman -- an unusual way to trim $1,200 from his annual insurancebill.

One option was to wear a fitness-tracking bracelet from Fitbit Inc. to earn points toward cheaper health insurance. With the gadget, the 51-year-old walked more than 1 million steps over several months, wirelessly logging the activity on the device. Twelve months later, Slagle has added to his new exercise regimen by trading burgers for salads and soda for water, dropping 70 pounds (31.8 kilograms) and 10 pant sizes in the process.

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