The race for the starting spot alongside Peyton Manning in the Broncos' offense is wide open following the release of Willis McGahee earlier this summer.
Hillman will battle Knowshon Moreno and 2013 draftee Montee Ball to earn the place in John Fox's side.
He told reporters: "You want to be that guy that's able to play every down. That's what I work toward. It's been my emphasis and hopefully that happens."
Denver begin their pre-season campaign against the San Francisco 49ers on Thursday.