via @jhharrison92

They don't call him the "Silverback" for nothing. Thirty-six-year-old Pittsburgh Steelers linebacker James Harrison is at the tail end of his career, but as this video shows, his strength is still in elite form.

Here we see Harrison performing a one-armed shoulder press using a 45-pound Olympic barbell with 45-pound plates on each end. That's 135 pounds, and unthinkable stabilization.

Even more impressive—this apparently came after he did reps with 115 pounds.

Stay tuned, folks. Harrison hasn't thrown in the towel just yet.

[James Harrison]