The art of swing bowling takes a lot of practise. Once you master how to swing a cricket ball it should give you a considerable advantage over the batsman.The reasons behind a swinging cricket ball are the subject of many discussions around the world and there is no set answer to this question.Factors such as the overhead conditions, the grass and moisture on the ground and even the location can all affect whether the cricket ball is going to move in the air. Watch video in link below
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It is generally accepted though that moisture in the air will certainly increase the chances of swinging the ball. So a damp pitch or a cloudy day would make conditions perfect for the bowler.Of course, conditions alone will not automatically make the cricket ball deviate. The bowler would have to look after the ball. This means that the ball needs to be ‘shined up’ by rubbing it on the trousers. Also, only one side would need to be shined and often the team will nominate a player to do this job throughout the match.A brand new ball will often swing for several overs before the lacquer has been rubbed away and without any work being done to it. From then onwards you will see the players frantically rubbing the ball between each delivery.