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Very good question to be fair

Im wondering the answer to this also but all i can offer at the moment is this

The ab vacuming thing was a "tool" bodybuilders used to use back when bodybuilding...

Umm... i get what you mean when you say this and the only reason i could give would be...

With your wallmart bar, like you say it weighs nothing and you put an amount of weight on there that is "...