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Let me try, quoting first sentence from Mark Rippetoe's book "Physical strength is the most important thing in your life."

Well, it is an article from 2010, in the good old days of content longer than 140 characters. :p

Nothing of substance can fit in a tweet.

What you just wrote is a counterexample.

The fact that it's a counterexample actually proves his point. :)

Maybe he got paid per word?