Gweb I am not sure if I understand exactly what you mean by "IK having dynamics". Are you asking if IK will react with Carraras physics engine? If that is your question, the new IK setting tool will place an IK target at the end of The chain and have the last bone set up to track it. Its a null or helper object and has no geometry so physics will not move it directly. You can however place an object like a sphere or cube primitive in the same position, scale it down to the same size, & add the track behavior to the IK target so it will in turn track the sphere/cube. Then you can apply directional force (physics) to the stand in object & the IK chain will follow along. mdc