From The New York Times:

Dr. Reisman saw that the practices had helped his boss recover, but he was not convinced. “Because you’re doing yoga, everyone has to do yoga?” Dr. Reisman shot back, as recalled by Mr. Bertolini.

Mr. Bertolini appealed to Dr. Reisman as a scientist. They would measure workers’ stress levels by tracking heart rate variability and cortisol levels, common measures of anxiety. And they would team with the Integrative Medicine Program at Duke University, which does research into the efficacy of alternative treatments.

When Mr. Bertolini reviewed Aetna’s financial performance for 2012, he noticed something surprising: Health care costs had fallen. For the year, paid medical claims per employee were down 7.3 percent. That amounted to about $9 million in savings. The next year, health care costs rose 5.7 percent, but have remained about 3 percent lower than they were before yoga and meditation were introduced at the company.