Our floor is a bit bouncy. I went into the crawl space and videod the problem. It seems like the joists are not sitting on the foundation properly and are springing.
OP's A to Z,
I cant open your video but what I can see is what looks like a bearing knee wall with a wall plate, & its not looking good.
As above the blockwork & plate appear to be loose.
Is this some kind of recent work? Some more pics & information might help?
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