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I am practicing myself on the Total Immersion style of swimming, as I am practicing for long distance triathlon.
After a lot of practice I am doing the 2 beat kicks with little difficulty.
Can someone tell me the optimum angle the body (core) should turn during the raise of an arm?
Sometimes I feel that I turn my core less and sometimes more.
Please let me know if more detail is required on this question.
While I can't suggest an optimum rotation angle for you without seeing you, I can suggest that it is hard to overdo it if you have good balance. For efficient distance swimming it is common to roll quite far and extend the shoulder forward, and many drills from Total Immersion encourage being completely on your side, such as kicking on your side and zipper switch. I also encourage my young swimmers to emphasize their roll while drilling to prevent long term injuries. It minimizes shoulder stress as their yardage increases, so it isn't something endeavor to do minimally. When sprinting, there is a trade off between the economies of efficiency, stroke rate, and power, so it is common to see less core roll in sprint events.
