The text doesn't say that however.
Nowhere does it say that Jesus is reigning with an iron rod for 1000 years. I will quote the KJV for you.
(Revelation 20:1-10)
And I saw an angel come down from heaven, having the key of the bottomless pit and a great chain in his hand. And he laid hold on the dragon, that old serpent, which is the Devil, and Satan, and bound him a thousand years, And cast him into the bottomless pit, and shut him up, and set a seal upon him, that he should deceive the nations no more, till the thousand years should be fulfilled: and after that he must be loosed a little season. And I saw thrones, and they sat upon them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; and they lived and reigned with Christ a thousand years. But the rest of the dead lived not again until the thousand years were finished. This is the first resurrection. Blessed and holy is he that hath part in the first resurrection: on such the second death hath no power, but they shall be priests of God and of Christ, and shall reign with him a thousand years. And when the thousand years are expired, Satan shall be loosed out of his prison, And shall go out to deceive the nations which are in the four quarters of the earth, Gog, and Magog, to gather them together to battle: the number of whom is as the sand of the sea. And they went up on the breadth of the earth, and compassed the camp of the saints about, and the beloved city: and fire came down from God out of heaven, and devoured them. And the devil that deceived them was cast into the lake of fire and brimstone, where the beast and the false prophet are, and shall be tormented day and night for ever and ever.
Notice that it doesn't say that "Christ is physically ruling this earth with an iron rod (for 1000 years).
It is not there. Your imagination may say it's there, but not the text. Your claim, by the way, which is not found in the text, is one reason why I began to question dispensational futurism. The concept of a 1000 year rule of Christ is not actually stated in the text. Since it isn't there, how did the teaching show up?
The fact is, such a teaching is irrational when there is no text to support it.
Meanwhile, every number that John uses is symbolic in Revelation and the rational mind will then ask "what image is John conveying to us in the numbers as they connect us to the Old Testament?"
Please, show your claim from the text or admit there is nothing for you to claim.