There is a logical reason for walking/jogging the width of the pool. It is because you can choose the appropriate depth for your height and the depth of the water remains consistent as you walk/jog. When you walk the length, you go through different depths. Believe it or not, it does make a difference when you are trying to maintain a consistent stride, especially for shorter folks and those who are struggling with balance issues. The water aerobics classes have you walk the width for that very reason. I walk and jog the width during open exercise, but only if I can do so without interfering with lap swimmers.
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