Jason Peters long has been the foundation of the Eagles' offense, so much so its success seems to be tied to his play. At least, it's probably no coincidence the club's last two losing seasons -- 2012 and 2015 -- corresponded with injuries to the left tackle.
To the extent quad and back injuries hurt Peters' performance last year, or how much of his decline can be traced to the fact that he turned 34 in January, nobody can say for sure. Either way, there's plenty of skepticism as to whether he's still reliable, much less if he can return to his All-Pro form.
For what it's worth, Peters doesn't sound like he shares those concerns. He arrived at training camp feeling rejuvenated and believes he has some good years left.
"I feel like I have gas in the tank," said Peters following Thursday's first full-team practice. "Before I got hurt, I wasn't even getting beat. At the same time, we were 1 on 1 on every play. Those guys get paid too, so you're gonna win some, you're gonna lose some."
Peters described himself as being at 75 percent for much of last season, adding that he doesn't need any extra motivation or feel as though he has anything to prove.
"No, I'm in Philly," said Peters. "Y'all get on me every year. I've been here since '09, and I've had a chip on my shoulder ever since I [came into the league] in '04, so I just come to play. The fans deserve championships and division titles, so that's what I'm striving for."
The eight-time Pro Bowler used the Eagles' Week 17 finale against the New York Giants -- a game in which he kept veteran defensive end Robert Ayers (now with the Tampa Bay Buccaneers) at bay -- as evidence he can still play.
"I show them every year," Peters says of his critics. "I got banged up last year, and then we finished with a win against the Giants. If you put the tape on, Ayers was trying to beat me. He was a free agent and he's a good rusher.
"So as long as I'm healthy, I'm going to be a dominant force."
Strong words, but Peters has reasons to feel confident beyond recovering from injuries.
Last season, he showed up for camp at a reduced weight, a decision offensive linemen often make in an effort to prolong their careers. While it's worked for others, Peters now believes it wasn't the right move for him.
"I tapered down last year and I felt like it took away from some of my game a little bit. This year I put on about 10 to 12 (pounds) and I feel real good. I feel stronger and I'm ready to go," said Peters, adding that he's back back to his preferred playing weight of 345.
But perhaps the aspect Peters is most optimistic for in 2016 is the head coaching change to Doug Pederson and how that equates to a return to a familiar offensive system and approach.
Peters is incredibly versatile and could've played in any scheme, at least he could in his prime. Based on some of the other comments he made however, clearly he did not find Chip Kelly's methods to be ideal (see story). More specifically, he made no secret of his affinity for Pederson's mentor and long-time Eagles head coach Andy Reid.
"Just getting back into this, the ground and pound, the old Andy Reid offense, I'm excited," said Peters.
"I can adjust to any offense, you've seen that," Peters continued. "From (offensive line coaches) Howard Mudd to (Jeff Stoutland) to (Juan Castillo), they all teach different schemes and different techniques, and it really doesn't matter. I'm happy to have the Andy Reid era back, which is Doug, and I'm ready to go."
Pederson also plans to rest Peters during the season in an effort to keep the aging left tackle ready for gameday, which he admits "caught up to" him last season.
Despite his confidence level remaining high, Peters is realistic too and understands he can't play in the NFL forever. While he wouldn't go so far as to put an expiration date on his career, he knows at this point that any season could be his last.
"I'm year to year," Peters admitted. "I don't want to put a number on it. You can watch me out here, watch some of the younger guys, and you can be the judge."
Maybe that's why 2015 under Kelly was an especially tough year.
"It was frustrating," admitted Peters. "An older guy like me, I'm just trying to get that ring, and to keep losing like that, it was hurtful."
Beyond getting healthy, most of all Peters just sounds happy to put the drama of the past year behind him. And despite all of the concerns over what he has left, there's little doubt he still gives the Eagles to win on Sundays when he's in the lineup.