And your question? If it's 'how do I do it?', then I'd ensure the centre of the bush is not overcrowded, and tidy out any damaged and dead growth. Perhaps remove some of the oldest and thinnest growth allowing strong new shoots already in place to take precedence. You can tip prune the newest growths back to a bud about 3in (8cm), which will aid fruit size. Try and aim for an open centre of the bush to keep air flow to a maxmum. this will help against mildew. Difficult to describe it, without showing you, so I'd Google it as well. Worthy