Line and length for spin bowling
Dehradun Cricket Academy
https://dehraduncricketacademy.com/learn/spin-bowling-length/

A useful spinning delivery must ask the batter a question. Work on where the ball lands and how that fits your plan; there is no single perfect length independent of the batter, surface and field.

Define the target
Choose an area with your coach and explain its purpose. A target is more meaningful when you can say whether it aims to encourage a forward movement, restrict a scoring option or support a particular field.

Record landing and response
Watch where the ball pitches, then what the batter does. Keep these observations separate: a batter’s mistake can reward a poorly executed ball, and a good ball can still be played well.

Change one part of the plan
When you adjust the target, keep a clear reason. Avoid chasing the previous shot with a completely different line, length and pace unless the new plan genuinely requires it.

A spinner plans to make a batter play forward, but most balls land shorter than intended. The first issue is execution, not proof that the plan cannot work. Review the landing pattern before changing the field or adding another variation.

Name / date
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What response should this length encourage?
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Where is the actual landing pattern?
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Does my field support the intended delivery?
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What did I try and what happened?
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Coach’s feedback and next step
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Video credit: cricket.com.au
https://www.youtube.com/watch?v=0kH_QwWtF7U