Treadmill? running through stationary poles?
Shirley, you jest!
I have a 6-pound tuxedo and a permanent scar on my left hand from trying to make her do something she didn't want to do.
If she ever weighed 12 pounds I would have to have "urgent care" on speed dial and get additional health insurance.
Otherwise she's a one person lap kitty, affectionate, but very independent.
Originally a semi-feral porch cat, she is now an indoor cat, totally indifferent to exercise.
But I have total control of her food. Heh. and she can't overeat. Every time she tries, she barfs.
We’ve tried everything possible to get the weight off of my female Maine Coon. Nothing works, so we just let her waddle happily along.