It is simple really.
I just make sure that I get in a good stretch work out every day, in addition to my cardio work out.
The cardio part is just tearing around the house as fast as I can, and includes racing along the back of the couch and jumping over the back of the big easy chair.
Every few days I also incorporate tree climbing. I'm up to four trees each session now. I always try to climb just a little higher each time too.
But stretching is key to staying limber. If you just do cardio you won't be able to make the kinds of moves necessary to get the string when it is dangled and pulled by the feeder folk.
So...begin with a nice cross stretch with right paw over left.
Bend your tail in the same direction as your right paw.
Keep your head and ears up, following the direction of your stretch.
For an added work out, hold your paw up for a count of five.
Try looking to your right.
Stand and cross your legs, holding your paw up for a count of nine.
Or one count for each life you have left.