EVANSTON, Ill. -- Northwestern running back Venric Mark stands just 5-foot-8 and weighs only 171 pounds, but he has a nose tackle-sized chip on his shoulder.
It's why his favorite run play is the inside zone. It's why he often gets in the face of defenders half a foot taller after between-the-tackles runs. It's why he runs to contact rather than away from it, like many backs his size.
"There's no question on Venric's toughness," Northwestern coach Pat Fitzgerald said. "He's a tough, tough guy."
But is he a durable Big Ten running back? Mark suffered some minor injuries during the second half of the 2012 season, in which he rushed for 1,366 yards and 12 touchdowns and led the Big Ten with 2,171 all-purpose yards.
Although Mark started all 13 games at running back for the Wildcats, he got banged up against Boston College, Nebraska, Michigan and Michigan State and eclipsed 18 carries just once in the final six games. Some question whether Mark -- with his size and style of play -- is built to last, even though he tied for fourth in the Big Ten in carries (226) last fall.
Mark greets the durability doubts much like he does those bigger, seemingly badder defenders -- head on.
"They're always talking about, 'Is he durable? Is he durable?'" Mark told ESPN.com. "That was my first year playing running back. People see that I played my freshman and sophomore year. Yeah, but I wasn't an every-down back. So this year, I know what to expect from myself, being my last year, and everybody's going to say, 'Can he last? Can he last?'
"I'm going to let them do their job and talk. I'm just going to play."
He also won't forget what has been said or written.
"It gets on my nerves," he said.
Mark also isn't naïve about the wear and tear his body will take this coming season. Just because he has been through a season as a No. 1 back doesn't mean he'll last through another. And he can't do a whole lot about his size. This winter, he has gained seven pounds to check in at 171 after losing some weight because of injury during the season. He hopes to play this season around 175 pounds.
To prepare himself for the pounding, Mark has been running and cutting with a 20-pound weight vest. Mark wants to emulate how Northwestern quarterback Kain Colter uses his vision to scan the field while still keeping his shoulders square when running between the tackles.
"For instance, if Kain and I, we're running 2-Knife, and I'm running inside zone, and a defender sticks his arm to turn me, [the vest] will help me keep my shoulders square," said Mark, a second-team All-Big Ten selection at running back and an All-American at punt returner. "That way, if a linebacker comes to my right or left, I can plant and still cut instead of running like this [shows his shoulders turning] where I can't make that move."
Mark also talks about the need to play smarter.
"Instead of trying to always run over people, at my size, I need to dip and drive, I need to sometimes cut back, juke," Mark said. "That will help me last longer, of course."
Mark averaged 17.4 carries per game in 2012 and had 20 carries or more just four times. He said 16 carries is the "minimum, minimum" amount he'd like to have in 2013 and would "prefer to get close to 20."
Wildcats offensive coordinator Mick McCall puts a greater value on overall touches than carries. This especially applies to a player like Mark, who averaged 18.7 yards on punt returns with two touchdowns, also serves as Northwestern's primary kick returner and had 20 receptions last season. And McCall doesn't just look at total touches, but what types of plays are being run.
"If it's inside zone 16 or 17 times, that might be a little high for Venric," McCall said. "If it's 20-25 touches but half of those are out in space, that's not bad. So we've got to manage him, how many touches he gets but more so, where he touches the ball.
"Some of it's got to be inside, there's no doubt. He does a great job in there. And as much as you want to manage it, he's still going to get dinged up. If he was a 225-pound back, look at the big backs from a year ago in our conference, they still get dinged up. That's part of that position."
McCall fully expects to play multiple running backs and multiple quarterbacks every year. And he has been pleased with the emerging depth this spring at running back with senior Mike Trumpy, junior Treyvon Green, and redshirt freshmen Malin Jones and Stephen Buckley.
But Northwestern's coaches have no doubts about their No. 1 back. And Mark expects to prove he's built to last this fall.
"He took some hits last year that he didn't need to take," Fitzgerald said. "It was similar to a quarterback going through his first year. V learned a lot on how he's got to take care of his body. The next step is just being smarter.
"He doesn't need to prove his toughness to anybody. That's always been his trademark."