Regular volleyball doesn't cut it for James Harrison and his Steelers teammates.

Instead, the group decided to invent their version of the game and call it "Danneyball."

The kicker: They use a giant medicine ball instead of a regular volleyball.

MORE: Who can blame Harrison for not trusting NFL?

 

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deo posted by James Harrison (@jhharrison92) on Jun 28, 2016 at 4:55pm PDT

The object of the game is to throw the medicine ball over the net hot potato style until it falls to the ground. Harrison, 38, seems to be a pro at Danneyball. He played the absurd game last summer, too.

Forget PED use, NFL. Danneyball clearly is how Harrison maintains his brute strength.