Creates a pose to serve as a neutral position for an inverse kinematic skeleton before you start to animate.
Choose Animation > IK > Set Rest Pose 
❒ to open the Rest Pose Options box:
None – Sets a pose for selected joints only.
Above – Sets a pose for selected joints and all joints above them.
Below – Sets a pose for selected joints and all joints below them.
Both – Sets a pose for selected joints and all joints above and below them.
Used – Sets a pose for all joints that have been transformed.
All – Sets a pose for every joint in the skeleton.
Rotation – Sets a pose for rotation parameters.
Translation – Sets a pose for translation parameters.
Both – Sets a pose for both rotation and translation parameters.
