i have a small VR project in unity that has a virtual body that responds to the user's movement, when you look around or lean in a direction the torso follows. I want to have the body's hands stay in a fixed place at certain points but for the torso movement to still work as the player looks around, and the problem is the hand will move since it's attached to the a joint chain starting from the spine joint that the movement script is applied to. i have peripheral knowledge of FK and IK and I'm not sure which, if either, I should use to address this, or how. any suggestions?