When people talk listen completely. Don’t be thinking what you’re going to say. Most people never listen. Nor do they observe. You should be able to go into a room and when you come out know everything that you saw there and not only that. If that room gave you any feeling you should know exactly what it was that gave you that feeling. Try that for practice. When you’re in town stand outside the theatre and see how the people differ in the way they get out of taxis or motor cars. There are a thousand ways to practice. And always think of other people.
If we get into a fish see exactly what it is that everyone does. If you get a kick out of it while he is jumping remember back until you see exactly what the action was that gave you the emotion. Whether it was the rising of the line from the water and the way it tightened like a fiddle string until drops started from it, or the way he smashed and threw water when he jumped. Remember what the noises were and what was said. Find what gave you the emotion; what the action was that gave you the excitement. Then write it down making it clear so the reader will see it too and have the same feeling that you had. That’s a five finger exercise.
Hemingway on writing