Team LightWave rotation technique 

This stroke technique has been proven to not be effective. She is reaching way past her foot. There is no power in the stroke at that point. Her body is so far off balance that the strain is on the lower back not lats. My opinion

Nice explanation , but I feel that your hand needs to be further down the shaft, nearer to the blade.

is top arm drive not a feature of your stroke?

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But How do dey avoid having cramps on one side ? An unbalanced repetitive action is bound to cause cramps.