Like little kids and adults, cats need toys to keep them amused. Of course, some cats re more energetic than others so a ball with a bell in it can provide hours of fun chasing it around. Yet for those more sedentary cats, you might want to consider other types of toys.
Consider a robotic mouse that roams around the floor under battery power. Or another robotic wand toy that flicks a wand around for cats to chase without having to run very far? There’s also a circular toy with a ball in it so a cat can simply sit there and knock the ball around without moving.
Think of what type of toy most people would want that wouldn’t force them to move much and that’s probably the type of toy your cat will enjoy as well.