PHOTO: Steelers' James Harrison leg presses over 1,000 pounds

He may be 37 years old and likely closing in on the end of his NFL career, but Pittsburgh Steelers linebacker James Harrison doesn't appear to be showing any signs of slowing down in the weight room.

Steelers teammate Ramon Foster shared a picture of Harrison on his Instagram account Tuesday, explaining in the caption that the veteran was putting up more than 1,000 pounds on the leg press machine.

Harrison came out of a short-lived retirement to rejoin the Steelers several weeks into the 2014 season, recording an impressive 5.5 sacks in 11 games and landing himself a new two-year contract.