Evaluate each cell in a table column - quickest method?

Though I could get the row number of the top and bottom rows in a table (a formal table created by Insert:Table) or get the number of rows and then do a For/Next loop with a counter for each cell, is there a more efficient way to run through all the cells in a table column?

I need to verify that each cell has numerical data in it, if not then I either need to

1. extract it to numerical if it is a number that has been formatted as text or has any mistakes with leading or trailing text,
2. otherwise change the entry to a "0".

Kind of wondering if there is a way similar when evaluating collections such as worksheets to using

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where ws has already been defined as a worksheet type, other than making a class somehow out of the cells in the column!

Thank-you!!!

As always, THANK-YOU!
(Steamboat Springs? It's hard enough finding work in Colorado Springs if one is not military!)

@skywriter: Thanks!
@alansidman: Congrats!