ENGLEWOOD, Colo. -- Running back Ronnie Hillman isn't paying attention to the depth chart. But he isn't satisfied with his current status on the team. He said hopes to earn his coaches' trust and a more prominent role on the offense.

"I'm not practicing or being out here to be the No. 2," Hillman said. "I'm going to be out here doing what I can and showing what I can going into next year."

He said part of the process of showing his worth is holding himself accountable for his mistakes and to make as few mistakes as possible. Even though it's only OTAs, he said he wants to show his coaches that they can depend on him.

Hillman feels stronger than last season and gained some weight. With the weight gain, he said he feels more explosive than last season.

"You know he's worked very hard this offseason as far as being the best shape he can be in," said Head Coach John Fox. "As far as coming back, reporting to camp, weight, strength, all those things … So really just being a year better and understanding what we're doing and what it means to be a pro football player."

Hillman, who finished the 2013 campaign with 55 carries for 218 yards, said he got too relaxed last season. He learned that he needs to work as hard as he can every day.

"You've just got to come to work with a chip on your shoulder," Hillman said. "It's easy to say you're going to practice hard and work hard, but you've just got to show it. Right now is the time. These next couple of months are crucial. The job's open, and I'm going after it. I'm not working to be No. 2."