At 5-foot-6 and 175 pounds, the former Colorado Buffalo is much smaller than the prototypical NFL running back, but said criticism of his size hasn't been talked about.
"No, I haven't heard that actually," Stewart said after working out for pro scouts on Thursday at CU.
Even if those concerns had come up, Stewart wouldn't worry about them. He's confident he's got the tools to make it as a pro.
"Definitely," he said. "Football is something that comes naturally to me. I feel very confident. All I need is for that one team to give me a chance and I'll show them what I've got."
Stewart left CU as the second-leading rusher in school history, with 3,598 yards. CU offensive coordinator Eric Bieniemy is the only Buff to rush for more (3,940 yards from 1987-90). Bieniemy, himself, wasn't a big guy (5-7, 205), but had a nine-year NFL career.
"EB is an amazing coach, amazing motivator," Stewart said. "He's definitely one of my role models. He's taught me a lot of things about football."
In addition to playing running back, Stewart's talent as a kick returner could entice teams. He averaged 21.7 yards on 11 returns last season for CU and also returned punts.
"I heard a lot of teams want me to play special teams," he said. "That's something I'm working on now so I can be more comfortable at the next level."
No matter where he plays or what position he plays, Stewart said the process of preparing for pro football has been unique, but fun.
"It's definitely interesting, but I think I've been in more nerve-racking situations," he said. "I just love football. Working out is fun for me and something I wish I could do forever."