Instructions
Sign into an existing Kinectimals game or start a new one. Ensure that your Kinect is properly tuned and able to see your entire body and stay inside the ideal playing area, 6 to 7 feet in front of the sensor.
Travel to your favorite location from the main map and, if necessary, wait until Bumble finishes talking and your animal joins you on the screen.
Go into freeplay mode and open your toy box. Sweep your arms to the left and right until you find the whistle. Select it by holding your hand over the whistle until the circle around it fills up.
Hold your arms out directly in front of you and slowly trace wide circles in the air in a counterclockwise motion. Continue until your Kinectimal rolls backwards. It has now learned the trick, which can now be performed on command.