Tulkas is actualy the name of one of the greatest Valar in Middle Earth in JRR Tolkien's Silmarillion. Here are some direct quotes....

" hearing in the far heaven that there was a war in the Little Kingdom; and Arda was filled with the sound of his laughter. So came Tulkas the Strong, whose anger passes like a mightly wind, scattering clouds and darkness before it, and Melkor fled before his wrath and his laughter."

" Greatest in strength and deeds of prowess is Tulkas, who is surnamed Astaldo, the Valiant. He came last to Arda, to aid the Valar in the first battles with Melkor. He delights in wrestling and in contests of strength; and he rides no steed, for he can outrun all things that go on feet, and he is tireless. His hair and beard are golden, and his flesh ruddy; his weapons his hands. He has little heed for either the past or the future, and is of no avail as a counsellor, but is a hardy friend. "--The Silmarillion, "Valaquenta"

" But at the last the gates of Utumno were broken and the halls unroofed, and Melkor took refuge in the uttermost pit. Then Tulkas stood forth as champion of the Valar and wrestled with him, and cast him down upon his face; and he was bound with the chain Angainor that Aulë had wrought, and led captive; and the world had peace for a long age." --The Silmarillion, "Of the Coming of the Elves"