Well In swinger is the delivery which curves into the batsman, swinging in the air, before or after hitting the pitch.
A complete video analysis on how to bowl a Inswing of this type
So how to bowl this kind of Inswingers ?
Gripping the ball:
Well to swing the ball into the batsman you need to grip the ball in this way, you need to concentrate on the middle finger which plays the major role in directing the position of the seam towards the batsman or leg slip region, therefore the middle finger has to be rested firmly on the right edge part of the seam and finally the index finger should be partly separated from the seam, rested softly or gently on left leather part of the seam.
Remember the direction of position of the seam has to be towards the batsman or leg slip region.
Direction of position of the seam:
Well when the ball is new and hard, to curve or swing the ball into the batsman, the direction of position of the seam has to be towards the batsman or leg slip region.
Here now majorly with the help of middle finger and also with the support of index finger, the direction of position of the seam is made to face towards the batsman or leg slip region, which actually becomes the key in helping the moving ball to curve or swing into the batsman in the air before or after hitting the pitch.
Position of arm:
Well to become a genuine swing bowler, high arm bowling action is preferred rather than the round arm bowling action.
So, to bowl this kind of inswinger, the position of arm has to be raised nearly at an angle of 90 degrees or should be nearly perpendicular with respect to horizontal shoulder level position.
Position of wrist:
Finally the wrist has to be cocked for the perfect release of the ball with the seam facing towards the batsman or leg slip region.
So these are all the different things you need to concentrate when you actually swing the ball into the batsman.
At the end of the day this is the one way you curve or swing the ball into the batsman when the ball actually is new and hard.