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Watch Steelers LB James Harrison bench press 500 pounds (Video)

As evidenced by the two-year, $2.75 million extension James Harrison signed with the Pittsburgh Steelers in March, the 37-year-old linebacker is still a valuable contributor to a defense.

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A video Harrison posted on his Instagram account Tuesday gives you a glimpse into how he can still play at a high level after 11 seasons as a pro.

That’s two reps of 505 pounds that Harrison is bench pressing. That’s some impressive strength.

Harrison spent the first 10 years of his career in Pittsburgh, earning two Super Bowl rings, a Defensive Player of the Year award, five Pro Bowl nods and two first-team All-Pro selections, before a one-year stint with the Cincinnati Bengals in 2013.

He announced his retirement in August following that year in Cincinnati, but returned to the Steelers less than a month later and registered 45 tackles and 5.5 sacks in 11 games.

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Sam Cooper is a contributor for the Yahoo Sports blogs. Have a tip? Email him or follow him on Twitter!