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Massage. If you find yourself, as some swimmers do, getting unusually tight in the upper shoulders and back, get a short massage to loosen up. Also, ask your coach for some stretches that will keep you loose and help you avoid getting that tight again.
The looser your muscles are in generally, the easier they are to stretch. You should stretch even when you don't feel tight, that way you will not become tight and your body will perform better.