Regular volleyball just doesn't cut it for James Harrison and his Pittsburgh Steelers team-mates as they prepare for the new NFL season.
Instead, the group decided to invent their version of the game and call it "Danneyball."
The twist? They use a giant medicine ball instead of a regular volleyball.
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 as he played the game last preseason as well.