Alfred Morris has said that he was like a "lost little puppy" during his first year in the NFL.
The Washington Redskins running back recorded 1,613 rushing yards and 13 touchdowns during the 2012 season.
The 24-year-old told the Pensacola News Journal: "Teams this year, they know about me. Last year, I was, in a sense, a surprise. This year, they know about me.
"I know it's going to be tough because I know it's going to be a bigger challenge, but I love a challenge. I'm looking forward to this year.
"Last year, I was going in there like a lost little puppy. This year, I'm a lot more confident and more comfortable."
Only league MVP Adrian Peterson had more rushing yards than Morris in 2012.