Pittsburgh Steelers Freeze Time With 'Mannequin Challenge'

Here's super cool video of the Pittsburgh Steelers joining in the latest Internet craze ... the "Mannequin Challenge."

It's basically a bunch of guys standing still in a fixed poses ... which doesn't sound all that impressive admittedly ... but when you see it in action ... it's insanely dope.

They pulled it off in the locker room with big names in on the action like Antonio Brown completely motionless talking to reporters ... and James Harrison not moving a muscle but still showing how strong he is.