How to make an very extensive Squash and Stretch rig? I would like to make a rig that behaves like this: https://youtu.be/QHsrRRfE8VY?t=41

So a extensive rig, that has on top of that an extensive squash and stretch functionality.

Should I somehow parent everything to a bone with a Stretch To -constraint or something?
Yeah, I guess the universal stretch to -bone is one solution... maybe



With two stretchers it's way better, though:



Oh, but Bendy Bones might be even better for the main core rig.
This was an essential addon to make those bbones, then I just joined them together.



Oh yeah, progress: