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中 It would be great to have a long, healthy and happy life, and that's why scientists are constantly seeking out evidence that will show us what we need to do to achieve longevity. We all know that regular exercise is good for us. In recent years we've been told to aim to walk 10,000 steps a day to remain healthy, although other advice to do three brisk 10-minute walks a day is thought to be even more effective.