Rehab is a long, painstaking process, one with multiple starts, stops, and steps. Dallas Cowboys center Travis Frederick understands that reality as well as anyone after missing all of last season following an August diagnosis of Guillain-Barré syndrome, a condition that results in rapid-onset muscle weakness.

In December, Frederick said during a radio appearance that he feels “very good” about his prospects for returning in 2019. Over two months later, has he earned a completely clean bill of health leading up to voluntary workouts?

“I don’t know if it’s going to be 100 percent full go. I don’t if it’s going to be some,” Frederick said of his level of participation in upcoming voluntary workouts, per Cowboys beat writer Rob Phillips. “We’re just going to kind of feel it out sort of as we’ve felt this whole process. … I’m to the point now where I can do almost everything that I’ve been able to do previously. Now, am I running at my top speed? I don’t know because I haven’t hit that number. Am I jumping as high as I have? I’m not sure yet. But once we get back in March and April we’ll get a good feeling on where things are.”

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Frederick didn't miss a single start over his first five seasons with the Cowboys, establishing himself as one of the game's top interior offensive lineman. He was a Pro Bowler every season from 2014 to 2017, and was named All-Pro in 2014, 2015, and 2016.

Dallas surrendered 56 sacks last season without Frederick in the lineup, second-most in the NFL, after allowing just 32 sacks in 2017.