Vikings left tackle Matt Kalil is listed at 308 pounds. He revealed Wednesday that he’s actually at 324, but don’t think he’s overweight.

Kalil, who struggled last season because of knee issues, said it’s all part of an offseason program that has him in the best shape since his rookie season in 2012.

“I’m the heaviest and strongest I’ve been,” Kalil said after Wednesday’s organized team activities. “Just going back to my roots, trying this diet stuff and I’m just going back to the basics that got me here in the first place. Back to the lifting I used to do, back to all the strengthening stuff.”

Kalil said he’s trying to eat better but is consuming enough calories to maintain his current weight. He wants to play this season at around 320 pounds.

A Pro Bowler in 2012, Kalil struggled at times last season. He said January arthroscopic surgery on both knees already has made a big difference.

“I feel better now and I’m kind of working to get my legs stronger and my feet back underneath me,” he said. “But the thing is now I feel healthy, which is awesome to go out there. It’s fun to play football again.”

Vikings coach Mike Zimmer commended Kalil for not missing any games — and just two practices — despite playing in pain.

“I just wasn’t healthy,” said Kalil, who turns 26 in July. “I obviously love to play football. I’d like to play for another five, six years. But when you’re hurting like that, you’ve got to go to practice every day knowing you’re going to fight through pain. It just kind of takes its toll on you.

“I’ve got a pep in my step. I can go out there and focus on getting better rather than focusing on surviving the practice.”

It’s been noticeable. Guard Brandon Fusco, a second-year man when Kalil was a rookie, said he hasn’t seen his linemate look any better.

“He’s a good player,” Fusco said. “He might think that maybe it wasn’t his best year; maybe he wasn’t completely healthy. This is the best I’ve ever seen Matt Kalil since I’ve been here. His legs, his knees seem great. He’s moving great out there. He knows the playbook a lot better. So the mental side, I think it’s going to help him slow down and help his game a lot more.”

The Vikings showed their confidence in Kalil this month when they picked up his fifth-year contract option of $11.096 million for 2016, although it is guaranteed only in the event of an injury.

Kalil is eager to show it was a wise move.

“I’m ready to get after it,” he said. “It’s good to say I’m going to come out and have my best year, but this year I think I’m going to just take it step by step, get my back feet back underneath me and take it one game at a time.”