How to make a draggable body with IK legs?

Hello, my question is if I can have a character with a draggable body, with legs that stay in place and knees that bend? Recently I had an animation I needed to do and it would have been nice if I could have that sort of effect. You can have IK arms, and you can have draggable legs, and walking legs, but I've never seen a tutorial or instance of anyone having a character that can bounce up and down and have the legs bend but stay in place. This is fairly easy to do with 3D rigging but I haven't been able to get this to work in character animator.

Here is an attempt I've made to get there. I've tried rigging the legs like you would for a walk cycle, I've tried making them independent and non independent. Here's what the leg rig currently looks like:

I wondered if tricking character animator into thinking the legs were IK arms would allow the behavior I wanted but it didn't work. I tried with both tagging them as arms and legs and the result is the same. If anyone knows of a way to achieve this please let me know. Thanks!