Only twelve minutes of exercise each week is enough to stay fit, according to a new study in PLOS One. The research, conducted by the Norwegian University of Science and Technology, found that four-minute bursts of vigorous physical activity three times each week could elevate oxygen intake levels as well as lower blood pressure and glucose levels. The scientists said: "Regular exercise training improves maximal oxygen uptake (VO2max), but the optimal intensity and volume necessary to obtain maximal benefit remains to be defined...

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