My father aged 49 gone through abdominal surgery bcoz of colon 15 months ago .But till date suffering from pain in incision part n muscles near incision And a ball  like  structure form when he coughs .On consultation with surgeon he concluded that the muscles are weak near that part n can heal with time passage or if their is severe discomfort we need to have one more minor surgery , I guess he pronounced ie :  patching Plz advice any measure to strengthen abdominal muscles without surgery or any diet n exercise N why the ball like structure form Durning cough near to incision .