How to Make Your Movement Underwater More Energy-Efficient
The duration of your dive is limited by your rate of air consumption, which in turn depends on how much energy you expend. Good finning technique, buoyancy control, and a streamlined profile will all make your movement underwater more energy-efficient.
from: http://ezinearticles.com/?How-to-Make-Your-Movement-Underwater-More-Energy-Efficient&id=6274142
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