I agree with FF re: micro managing ... my first hits are similar to those mentioned PLUS
1) Considering changing your swim prescription ... volume(?) technique (minor), load application (?) etc.
2) One nobody mentioned is your kick ... not how many beats BUT quite often the kick comes from the knee (knee bent, heal high) creates drag and takes you out of alignment
3) Head position ... could go down slightly (micromanaging BUT slightly better alignment)
4) Agree with extension / depth of front end too ... BUT someone mentioned rotate the shoulders, I say NO ... extend the shoulder forward and down (drive the hand forward and down with the shoulder) and that facilitates the hips to do the same thing (rotate) ...which of course makes breathing easier
... all these work well in the kinetic chain of the movement(s) you are trying to refine ... so much good stuff going on we should not be overly critical
Keep it rolling ...
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Dave Latourette
http://www.TTENation.com