Fox said that it was a tactic he learned from Chip Kelly for his New England Patriots offense, but feels that it could serve his side well this season.
"You want change of pace," Fox told NFL.com. "Just like a pitcher, you don't throw all fastballs.
"The good ones throw different speeds. They throw curves and sliders and changeups. That's the trend. Call it the 'Chip Kelly Effect'. We fell victim to it a year ago in New England. We kind of stole it from them, really."
The Broncos face the Baltimore Ravens on Thursday night.