In order to keep Deja's brain alive I thought of some variations in fetch.
1. On our forested property: Sit in heel position-give her the ball to hold, heel, sit. Release the ball by dropping it. Then; leave it and heel away from the ball, making turns etc. Stay and I walk away from her, come in front, heel position. Then: FIND IT! And she is off like a rocket. Initially she couldn't remember the ball when I moved too far from it so I had to build up the distractions and distance from the ball.
2. Heel while she holds the ball, sit or down, drop the ball, heel. Down-Stay and I go back to the ball. I get the ball and continue walking away from her, hide it and walk back to her. Halfway I call her to me in a heel position and walk away from the ball. Then in a walk :FIND IT! That last part was tricky as she could have easily run me over.
The variations are endless and also fun. These exercises are good for her general focus as well. And she forgets about the forest residents as a bonus.