Why is exercise good for you? Scientists are finding answers in our cells

wakes up in the morning, the first thing she does is pull on her trainers and go for a 5-kilometre run -and it's not just about staying fit."It's when I think and solve problems without knowing it," says Klarlund Pedersen, who specializes in internal medicine and infectious diseases at the University of Copenhagen."It's very important for my well-being."Whether it's running or lifting weights, it's no secret that exercise is good for your health.Research has found that briskly walking for 450 minutes each week is associated with living around 4.5 years longer than doing no leisure-time exercise 1 , and that engaging in regular physical activity can fortify the immune HOW EXERCISE BENEFITS YOUR CELLS AND OVERALL HEALTHDecades of evidence shows that exercise leads to healthier, longer lives.Researchers are just starting to work out what it does to cells to reap this reward.By Gemma Conroy Researchers are looking into the molecular basis of how exercise benefits health, to help treat diseases.