I also have anywhere from 2 to 4 cats in my workout room, the number directly proportional to the time it is until kitty dinner is served!
My guys aren't nearly cooperative enough to be volunteer free weights, but they definitely contribute to the whole "workout experience."
The kitty warm up has a furry MCM (Maine Coon mutt--she's a rescue, doubtful she's pure MC) stretched out on the floor to provide an agility move known as the "don't step on the cat" grapevine/stretch.
Form pointers are provided by my avatar kitty watching from the top of the entertainment armoire where the TV sits.
The kitty chest press involves a multicolor cat hanging from one end of the barbell, providing both additional weight and a core challenge since I'm not trying to drop the barbell on top of her (or me).
The kitty cool down involves two females licking the sweat off of my arms and legs at the end of the workout during the stretch. Very strange, and it's only the females that are interested in doing this.
I probably could get the furry one to be a free weight, she's most receptive to being picked up.