From Tuesday through Saturday each week, Sims has been spending 3 ½ hours in the morning at the Euclid Sports Plant preparing for both the NFL combine and the pro day at Ohio State.
Sims reps out on a set of lunges.
"You train real hard in the morning and then you rest for the remainder of the day," Sims said. "They don't play any games here. They work you out individually and help you to get ready for the combine."
Donte Whitner, Nate Salley and even Anthony Schlegel on occasion, along with Sims, have been training with the SpeedStrength program administered by Eric Lichter and his partner Tim Robertson, who founded the now-renowned training facility.
Sims, at 6-3 and 310 pounds now, couldn't be happier with his preparation for his testing.
"I come here every day and do my best and I feel really good about how I'm going to perform," he said. "Even if I should have a bad day I still think that I'll test out in the upper percentile of the offensive linemen. I just have to stay calm and be under control and give it my best effort, and I know I'll do a really good job when the time comes."
In the midst of preparing for the start of a career in the NFL, Sims is still trying to earn his degree in communications at OSU. He goes back to Columbus every Sunday from his place in Cleveland and attends one class each Monday. Sims is also taking an online class to help complete his degree.
"I'll have my degree in three-and-a-half years," he said with a big smile on his face. "It was a lot of hard work but it's worth it."
As he looked back on it, he said his whole time at Ohio State as certainly been worth it.
"I'm really going to miss it. Everything about Ohio State I'm going to miss," Sims said. "I love the people there and I have so many great memories from my time spent there, but it's time to move on."
Memories like winning the national championship as a starter in his freshman year and beating Michigan and Notre Dame in his senior campaign are some of the games that he'll remember most fondly.
"The game against Miami was definitely one of the big ones," Sims said. "The thing that I'll remember the most about it is the feeling afterward, after the clock went to zero and everybody was running on the field."
Sims went 3-1 in his career against Michigan but that last victory in the Big House was the one that meant the most to him.
"We never gave up," he said. "We never quit and we kept fighting and we wouldn't take no for an answer."
And beating Notre Dame to cap his career was really special also.
"Mort than anything else, because it was just the last game that I got to play with A.J. (Hawk), Bobby (Carpenter), Nick (Mangold) and Kuds (Mike Kudla)," Sims said. "We've been together so long and we were playing hard for each other so we could end our careers with a victory."
A four-year starter in all, Sims can't believe it all went by so fast.
"When I first started out, I really didn't even know what I was doing," said Sims who made his debut in week two of his freshman year against Kent State and made his first start three weeks later against Indiana. "But I played with a good group of guys and they were willing to help me out."
Sims displaying his tattoo and his physique at the same time.
The rest of his remarkable career as a Buckeye is now history. He never really imagined that he would have the kind of successful career that he had at Ohio State coming out of Nordonia High School.
"You're so focused and you just take it one day at a time," Sims said, "and before you know it, you look up and you've accomplished so much. I've had a great career and I'm so thankful for it."
And now Sims is hoping to have another great career at the next level. People in the NFL are telling Sims' agent that he will likely be a first-day selection, and he could possibly go as high as the late second-round.
"I'll play anywhere. I just think it's great that I'm going to have a chance to be able to play in the NFL," said Sims whose father Mickey, #78, played with the Cleveland Browns for a couple of seasons in the late 1970's before Rob was even born. "I'd love to play for the Cleveland Browns like my dad did, it would be a dream to be able to play for the Browns. But I'll be happy playing for whoever drafts me."
And when you look at the recent success of guys like LeCharles Bentley, Shane Olivea, Alex Stepanovich and Adrien Clarke in the NFL from Ohio State, Sims' draft status, after he performs well in his pro-day workout at Ohio State, will likely be on the rise.