Ravens also must deal with Broncos' secret weapon — high altitude

Jimmy Smith knew it was real the first time he walked up the big hill to football practice, his 18-year-old lungs unable to find enough air. In the years that followed, the images of husky linemen, gasping on the sidelines, only confirmed the potency of Colorado's thin, Rocky Mountain air.

By Childs Walker, The Baltimore Sun

January 9, 2013