James Harrison may never retire.

The Steelers linebacker, who will turn 38 in May, has not officially announced he’ll be returning for a 14th NFL season; he’s waiting to see how his off-season training goes. But he does have a year remaining on his contract, and the Steelers have expressed the desire for him to come back. Harrison remains a solid player despite his advanced age, as evidenced by his 40 tackles, five sacks and two forced fumbles in 2015.

The biggest reason why Harrison has been able to stay in the game for so long? His psychotic workout routine. No player in the league works harder than Harrison, and his obsession with the weight room has undoubtedly extended his career. Today was core day for the five-time Pro Bowler, and Harrison showed off a unique exercise that’s great for building anti-rotational stability:

Called a Pallof Iso Hold, it’s a variation of the traditional Pallof Press, and it’s an awesome exercise for building anti-rotational core strength and stability, which is a key to athletic performance. Oh, and it could also help you get a pretty mean six-pack:

How to Perform James Harrison’s Pallof Iso Hold

• Secure a band around the rack at shoulder height.
• Holding the band in your hands, step away from the rack. The farther away you are, the more resistance you’ll feel.
• Assume a shoulder-width stance with a slight bend in your knees and hold the band taut at chest level.
• Hold that position for six seconds, keeping your torso square and resisting the force to rotate.
• After you complete a set, switch sides.

Sets/Reps: 5×6-second holds on each side

RELATED: Pallof Press Variations for a Rock-Solid Core