Gray Cook put up a long article on his website. It's well worth reading.
In short, if supplements are basically patching holes in our diet, what is exercise? Is it the basis of our movement, or is it a supplement used to patch holes in our daily movement patterns?
Not to spoil the surprise, but it's the latter.
If you're familiar with the work of Gray Cook, Pete Egoscue, mobility and corrective exercises espoused by Bill Hartmann, Mike Roberston, and Eric Cressey, or the Mobility WOD of Kelly Starrett, you'll understand where he is going with this. It's a plea to look holistically, as the body as a whole piece, and address movement and pain as part of a whole.
Take the time to sit and read that, you won't regret it.
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