Rule No 2 : - Being relaxed. By relaxing in the water many people will add a third to their breath hold. This is all to do with keeping your heart beat slow and not using too much oxygen. When you are under water don't swim hard. Don't move fast. You would be good to move like slow motion. When you are trying to do an improved breath hold don't think of waves, currents, sharks or anything that gets you nervous, . Heart beat goes up... oxygen goes down. It is good to pull yourself along the bottom with your hands rather than finning. Arm muscles use less O2 than legs.
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