Unfortunately exercise is very specific, so running doesn't improve your swimming fitness because you use different muscle groups. What it definately does is improve your cardiovascular capacity, so as your muscles re-learn to swim again your swimming fitness will improve very quickly.
What's been said before is true though, concentrate on good technique as you train and as you get faster retain that technique, it's all too easy to lose form as one gets faster which once again makes it harder to swim.
Wayne AKA DrClean
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