Originally Posted by
froglegs
I have read that breathing only on one side can injure the opposite shoulder. My sister believes this as well, she used to swim competitively and was a left-side breather, and her right shoulder is pretty messed up now. When I started swimming again in Oct, I did too much too quickly and had to back off for a few weeks. My right shoulder was the one that hurt, and I was breathing only on the left side. So at that point I decided I was going to learn how to breathe on my right side as well.... although in a race I'll probably just revert to left-side breathing, since I seem to get more air and less water that way. :)