Both health insurers and employers have a stake in driving down healthcare costs for their member populations. Increasingly, businesses are turning to payers to design wellness programs to aid in the effort.

But it's not as simple as handing out activity trackers or launching a member wellness portal. Every company is different and there are many ways to measure success.

FierceHealthPayer spoke to three health insurance executives to find out how they're designing wellness programs--and how they're demonstrating their value to customers.