Dr. Stuart McGill: Build a Strong, Pain-Proof Back

1029.16 - 1058.596 Stuart McGill

The people on the other side had to pay out the rope in sequence. And then I would say, okay, now let's twist a little bit. Anyway, you could imagine it was impossible to control. And then I took out the tennis balls And I put in what was a disc, a big round cylindrical piece of foam rubber. All of a sudden that added stiffness. So now, because the body uses stiffness as the control parameter.