Keep Your Cats Occupied

Cats  basically disregard what you want and are almost impracticable to train them to the point you would train a dog.
Have empty bode ready. Cats adore boxes, or any other tight spaces they can snuggle into. Take a shoe box and put it on the floor and wait. In about three minutes there will be one cat in it, I guarantee it. It will love the box so much that it will sleep in it, play with it to the point of turning it into ribbons. Cats don't play nice, they usually destroy their plaything. We just want to make sure that's not you. 

Build shelves. Put some shelves at various intervals and heights on the wall so the cat can climb up and jump from one to another. Cats also love heights because they give them a sense of security. Try putting some shelves up and see the effect.
Buy toys. Static toys are not fun for cats, but they enjoy something that squirms and won't stay still, like a dangling rope with a ball on the end of it or something similar. Or you can buy mice. A lot of them.
But scratching pads. Those are usually for sharpening their claws, otherwise they will redecorate the furniture. You can have the vet remove their claws through surgery, but keep in mind the claws are their only weapon and without them the cat cannot defend itself, and no one knows what the future may bring. Plus, it's a pretty invasive surgery that I consider barbaric.
Buy excellent food for the cat. Good eating will usually make it lazy. It also makes it fat, but that's a small amount to pay for your security, isn't it? Cats, enjoy humans, desire a certain level of calories and protein, otherwise they will become obscenely fat and that can be a important impediment for their vitality.