Sports you do for several reasons: for prevention, for fun, relaxation, energy or health. For people in particular that last reason, there is good news.
Depending on your goals you most likely train several times a week. Rightly an inexhaustible condition and a sculpted body, not just develop by itself. However, if you sport for health reasons, it appears that once a week strenuous exercising is enough.
Health considerations should be interpreted in this case as preventing premature death. The World Health Organization insists for years the importance of sport and highlights here several times a week. Research published in the NRC,showed that repetition is not really necessary: once a week intensive exercise is just as effective.
With a view to maintaining health and reducing the risk of premature death has once intense exercise the same effect as several times a week sports slightly shorter or less intense in the week. Of course, we want to encourage anyone to exercise less, but this conclusion is nice for people who struggle with time. The opinion of the researchers is: plan anyway one time a week, for example at the weekend, to do intensive sports one a half hour.
Research shows that this one hour a half a week sport decreases the risk of premature death by 30%. Several times a week of intensive sport (ie more than 1x 1.5 hours) reduces this risk up to 35%.