Thanks Knot - can't do any sort of work yet, but it's something to keep in mind. I've always had weak hip flexors so that makes sense. Weak ankles, too, but if the inside of the shoe won't support them maybe they'll strengthen on their own.

I'll just keep walking. At least this brace forces me to have good posture

I'm doing the walking with the VFFs, too, as it makes me pay more attention to my feet. I'm less likely to trip and fall (and hurt myself) wearing them.