Swimming is the most technical of all the disciplines we coach, partly because to move through water, which is 1500 times thicker than air, takes a good deal of skill but also because there are 4 competitive strokes all with their own set of rules.
The most efficient stroke is front crawl and the majority of recreational swimmers should aim to perform this particular stroke well as it's the fastest and most efficient of the four and will enable you to get very good fitness benefits from your swimming sessions pretty quickly.