Apple’s lab rats wear Lululemon. For the past two years, Apple paid people to exercise in a top-secret testing center wearing elaborate monitoring gear that made them look like Bane at a CrossFit gym.

At 24, Brian Jaffe got a job in the entertainment industry, sitting behind a desk all day. In just a few short years, his physique was not what it used to be. “I got out of shape,” says Jaffe, now 28.