Today I finished replacing the floor joist bridging and attaching headers to the interior walls.
The other day I ripped out all the wood blocking between the floor joists.
Then today I added nailless floor joist bridging.
The bridging was easy to install, but most importantly when I walked on the floor above it was completely silent.
I then added the headers to the interior walls.
It would have been easier to put these in when I was framing the wall.