This is done by clasping your fingers like in clapping but with a slight cup formed . The hand is cupped by holding the fingers together so that the shape of the cupped hand conforms to the chest wall . The cupped hand tends to trap a cushion of air which softens the blow of the clapping . It should be vigorous but not painful . It should not be done on bare skin , but over soft comfortable clothing or towel . When done correctly...
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