Jackson is responding with his best training camp since joining the Redskins in 2014. Forget that he skipped voluntary offseason practices — Jackson has never looked this sharp in August.

“People might be like, ‘He’s almost 30, he’s getting old.’ But I still feel like my speed is a great threat,” Jackson said.

Norman has dubbed the wide receiver “Flash” for his ability to break away from corners, and Jackson is used to challengers. There just haven’t been many to silence him. In eight seasons, Jackson has 442 receptions for 7,814 yards and 42 touchdowns.

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Jackson, who’s listed at 175 pounds, said he added weight over the offseason — something most fast receivers are reluctant to do. But he knows he needs to be a more effective blocker, and after missing seven games last year, he opted to fill out his wiry 5-foot-10 frame.

“I … just wanted to have a little more physicality to me,” Jackson said, “and just really go out there and be that guy that plays throughout the whole season. Just expect nothing but greatness from me. I’m trying to push myself, trying to challenge myself to go out there and do things like that. That’s kind of really what it was, nothing else behind it.”

The daily grind against Norman hasn’t gone unnoticed. Fans have been posting videos of Jackson scoring long touchdowns on the practice field.

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“The competition is there,” coach Jay Gruden said. “The last thing you want to do as a veteran or a guy trying to make the team is get your butt whupped.”

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If Peterson is ready for a showdown when Washington travels to Arizona on Dec. 4, Jackson says he’ll welcome the challenge. It’ll come three days after he turns 30.

“It’s all right to talk, but if you’re going to talk, you better back it up on the field,” Jackson said. “I’ve been one of them guys that if I’m going to talk, I’m going to talk on the field and my play is going to show.”

Jackson stretches offenses in the vertical passing game like few other receivers, so Washington could very well try to re-sign the free agent.

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But — like waiting one more season before inking quarterback Kirk Cousins to a long-term deal — the Redskins want to see Jackson prove himself again before committing wads of cash.

With his effort at training camp, the three-time Pro Bowler is priming himself for a productive season that could lead to another lucrative deal.

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“I’m just really keeping it real right here, keeping it real simple,” Jackson said. “Whatever that turns out to be at the end of the year, so be it.”