There are a couple funny things about "the big catwheel," an exercise wheel for cats. The first is just watching these two cats play on the wheel, which is amusing for reasons that are not exactly explicable. The second is the fact that the wheel keeps track of the distances and speeds the cats of traveled, which means that we get to imagine cats keep track of how much exercise they're getting and turning physical activity into a painful chore like it is for us humans. The big catwheel is not commercially available but if you want to find out how to make your own, here are the instructions.
• A Smart Cat Exercise Wheel That Comes With A Feline Fitness Tracker [Design Taxi]