Need help fixing a rotation problem in an animation

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1

I’m currently trying to create a sit-up animation and this is what I have so far:
https://gyazo.com/dd92a9f07da0c05cea27834833fda835

However, the legs are doing some weird kind of dip then jumps back up in the animation. I don’t have any keyframes designated for them to do that. Does anyone know this is happening?

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2

It’s probably because you have IK constraints on, or, you are moving your lower torso.

3

How do I turn off IK constraint?
And it’s R6 so there’s no lower torso.