Sometimes it would be a mix of real and fake so it would look like some real work was happening, but from the way the bar was moving, etc... I wouldn't be surprised if that was the full Ivanko aluminum trade show set that they lend or sell to movies and mags. On that set, the #45s were around #17lbs each, and had the metal ring to them.
Neat, that old wrestling stuff still makes me smile.