We have 2 indoor only and 4 that are in-and-out.

Like Taz_Zoee, we have an exercise track that all of them enjoy. Ours makes a complete circle, and it's fun to watch and see who is chasing whom. We have hardwood floors which makes the event even more interesting - adds the sliding factor.

We have a basket full of toys that is usually empty with the contents scattered all around the room. Laser light is a big favorite, as are the kitty whips.