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Training in the water must first and foremost be correct in terms of technique. Speed should be a consequence of this, not the main goal.
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To maximise the benefits, you should try to achieve a straightened and streamlined body position. There is no need to make sudden movements or exert excessive effort. There are two aspects to watch out for when swimming: correct body posture (this ensures that the movements are effective) and breathing (it should remain deep and even).