How do you setup a rig for Full Body IK?

Hi there,

I am attempting to use Full Body IK to set up a rig for me, however, each time I connect bones for the IK, my mesh breaks (see attached video). Does anyone have any suggestions (or can point me to resources) on how to correctly prepare a rig for Full Body IK?

I suspect it has something to do with the root bone but am a little out of my depth here.

I am also using UE 5 Early Access 2

The live streams about Control Rig cover a lot of that, but they’re totaling more than 5 hours by now, so I’d like to point you to this video by Andreas Suika. It’s about procedural animation, but he builds a rig with the FBIK node and goes over the individual inputs in great detail.