I use a snorkel regularly when doing kicking laps instead of using a kickboard. Ie try 4x25 Superman Flutter with snorkel, then remove it and transition to swimming: it's gold swimming. Anyway, not only a snorkel helps keeping the head still when swimming, but I find it also can tell you interesting info about your natural breathing rate: for instance, I usually breathe in every 3rd stroke, but when swimming with a snorkel - that is free breathing - I realize that I naturally breathe in every 4th stroke and exhale for 3 strokes. It definitely is a powerful tool to use, just my 2 cents
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