"They're very explosive, very naturally gifted," Brown said. "We have to get cleaned up on fundamentals and the effort and the finish is probably the biggest thing. As a player, I went hard every single day. I was relentless in my pursuit of trying to be great and I'm trying to transfer that to these guys."
The group also must tap into its more physical side, despite not carrying a ton of weight on their frames. None of the four running backs weigh 200 pounds, with Watson the closest at 198. Grooms is listed at 168 pounds, while Butler is listed at 173 and Taliaferro is listed at 184.
But Holliday isn't concerned with what he sees on the scale. He's concerned with what he sees when his backs run between the tackles.
"They're a lot more physical than what you think they are," Holliday said. "That weight room's been good for them. They'll stick it up in there and get a yard if they have to. I'm not concerned with how short they are. I'm concerned with how strong and physical they are."
The backs say they all feel stronger with the arrival of new strength and conditioning coach Scott Sinclair.
They not only weigh more for the most part, but they can lift more weight, and they already can feel the difference on the football field.
"I can't really say I feel the weight, but I feel the power," Grooms said. "That's one thing coming into this year that I want to progress in. I wanted to be a little more powerful. As time keeps coming I just feel stronger and stronger."
The Herd's running game played a significant part in the offense's meteoric rise up the Football Bowl Subdivision rankings, but much of the focus was on quarterback and Conference USA MVP Rakeem Cato and the Marshall passing game. Marshall's running backs are ready to add more balance to the equation and grind out the tough yards when necessary.
"When it comes to third and 1, all of us feel like we can get the first down," Grooms said. "We just know to get the ball and attack every time."
Contact sportswriter Derek Redd at derek.r...@dailymail.com or 304-348-1712. His blog is at blogs.dailymail.com/marshall. Follow him on Twitter @derekredd.