This is how I like to scratch most of the time -- standing at full length and pulling my spine upwards with my claws before a good downward stroke.. A lovely pilates stretch as well as an important way to leave a scent mark.
What do humans do?
They give us a tiny scratching post that wobbles. We can't get a proper stretch on it. We can't get a strong downward stroke with the claws. It's rubbish.
So what do we do?
We use the furniture, stupid. What else. Sometimes there's a door in soft wood to scratch on, but usually it has to be the sofa or an armchair. At the back it is high enough to get a good stretch and a firm downward stroke. L-o-v-e-l-y.
Then our humans have the cheek to object.