What is the relationship between tonic postures and the freeze? Tonic postures are ones that use a frame, like the Waltz. I don’t mean structure in the sense of transferring force to the ground, I just mean well integrated shapes that resist change from outside forces. Here is the idea. Certain types of movement may have evolved to work with the freeze, and the freeze itself might be a way to make the body more tonic for fighting or fleeing. The popular/conventional explanation of the freeze is that it makes you invisible (or undesirable) to predators. But as an evolutionary survival mechanism I think it would have to integrate with the other two (or three if you include dispassionate sex). [This is an update to 4 F’s theory: freeze, fight, flight, sex.]