John Underwood

Human performance consultant John Underwood is seen speaking to The Dalles High School senior Bre Birchfield after a talk he gave last Thursday at the high school.

It was the usual message—eat right, get enough sleep, don’t smoke or do drugs—but with a jaw-dropping twist: it had the sobering science to back it up.

In a rapid-fire presentation at The Dalles High School Thursday, John Underwood, trainer of Olympic champions and human performance consultant to professional athletes and Navy SEALs, covered the gamut of research on the ill effects of poor lifestyle choices.