The best anti-ageing technique could be standing up, scientists believe spending more time on two feet protects DNA. A study found that too much sitting down shortens telomeres（染色体终端）——the protective caps which sit at the end of chromosomes（染色体）.
Short telomeres can make people premature（过早的）ageing, ill and early death. So spending less time on the sofa could help people live longer by preventing their DNA from ageing.
The research found that people who often stood on their feet had longer telomeres. And it also finds that taking part in more exercise did not seem to have an impact on telomere length. The less time one person sits, the longer he will live.
In many countries formal exercise may be increasing, but at the same time people spend more time sitting. The biggest problem for people’s health is not to exercise less, but sitting for a long time. We think that a reduction（减少）in sitting hours is more important than an increase in exercise time to those premature ageing people. Researchers looked at 49 overweight adults in their late sixties and measured the length of the telomeres in their blood cells. Half of them took part in the exercise progra that lasted six months, while the other half did not. They used a pedometer to measure the amount of footsteps they walked each day. The amount of time spent sitting down was worked out through a questionnaire（调查问卷）.
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