From pushing a sled loaded with weights to hip-thrusting 675 pounds, 39-year-old James Harrison is a workout freak.

James Harrison's amazing feats of strength

From pushing a sled loaded with weights to hip-thrusting 675 pounds, 39-year-old James Harrison is a workout freak.

James Harrison gets pre-dawn workout in after win - NFL.com

James Harrison gets pre-dawn workout in after win - NFL.com

38-year-old James Harrison apparently went straight from the airport to the Steelers training facility, posting this at 6 a.m. (via @jhharrison92)

38-year-old James Harrison apparently went straight from the airport to the Steelers training facility, posting this at 6 a.m. (via @jhharrison92)

James Harrison's latest crazy workout video might be his craziest one

James Harrison's latest crazy workout video might be his craziest one

The NFL's Strongest Glutes? James Harrison Hip Thusts 675 Pounds for Reps -."Watch This" Push on Pic

Steelers LB James Harrison Reveals Weekly Workout Schedule

Steelers LB James Harrison Reveals Weekly Workout Schedule

​James Harrison Proves What an Insane Beast He Is On the Sled  http://www.menshealth.com/fitness/james-harrison-workout-instagram

​James Harrison Proves What an Insane Beast He Is On the Sled

​James Harrison Proves What an Insane Beast He Is On the Sled http://www.menshealth.com/fitness/james-harrison-workout-instagram

Quarterbacks should be shivering browsing James Harrison's Instagram account. The 39-year-old posted his latest workout Thursday.

Pittsburgh Steelers LB James Harrison shows off insane strength in workout video

Quarterbacks should be shivering browsing James Harrison's Instagram account. The 39-year-old posted his latest workout Thursday.

★ Lively Yellow ★ James Harrison makes one-handed, 135-pound shoulder press look easy https://www.facebook.com/jamieandpeterchristensen/posts/10155161667630461

★ Lively Yellow ★ James Harrison makes one-handed, 135-pound shoulder press look easy https://www.facebook.com/jamieandpeterchristensen/posts/10155161667630461

The last time the Steelers won the Super Bowl, James Harrison was their best player. There is no better measure of importance to a franchise ...

The last time the Steelers won the Super Bowl, James Harrison was their best player. There is no better measure of importance to a franchise ...

Pittsburgh Steelers linebacker James Harrison leads a dress-up workout with teammates Brett Keiser and Ike Taylor.

Pittsburgh Steelers linebacker James Harrison leads a dress-up workout with teammates Brett Keiser and Ike Taylor.

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