If you have hot air heat, find a floor register, or wall register and cut a corresponding hole in the bottom, and a vent in the top. Every time they hear the heater start they will run in. Of course this only works if you live in a cold climate
I did this for a whole winter once, and figuring that the heater started 3 times an hour, both cats lost weight from the exercise. The main reason cats hate us is we don’t keep our thermostats set at 80 degrees.
