Congruent Exercise 2: Just because you can doesn't mean you should

I'm still planning my full review of Bill DeSimone's excellent new book Congruent Exercise, but I saw a video the other day that made me think of one of the things he says in the book:

"Just because you can move a limb in a certain way, doesn't mean that you should, and it certainly doesn't mean you should move it that way with extra weight."

Bill talking about safe exercise choice but his words came back to me when I saw this.  Surely this guy shouldn't keep doing this!