You can reverse the order of keyframes in time. When you reverse keyframes, the first keyframe takes the place of the last, and the last takes the place of the first.

To reverse keyframes for a channel:

1. Click Animation, and then click Setup.
2. In the Channel hierarchy, select the channel you want to reverse.
3. Click Reverse Selected Curves.

   
   

   The selected channel's keyframes are reversed.