The second objective is to cut back sufficient foliage to check the growth of the tree, in other words, to slow it down. The third aim is to open out the centre of the tree so it resembles a Martini glass in shape. This allows lots of light into the centre of the tree, which results in more fruit and higher quality. Look to cut back about 50% of the leafy shoots.
By cutting back your tree in summer there is still sufficient time for regrowth to take place which will provide the fruit bearing shoots for peaches and nectarines, for example, to form in time for fruiting next year.
Once winter has arrived and all the foliage has dropped its possible to look at your tree and remove any dead shoots and crowding stems that are growing inwards. This won't take long as the heavy lifting has already been done in summer.