Exercising every day can make you seem biologically younger than those who do no exercise, say scientists. Inactivity not only leads to a greater risk of age–related diseases but also may influence the ageing process. Academics from Kings College London and in the US studied over 2,000 twins analysing telomeres which protect cells from damage. Telomeres shorten with age increasing susceptibility to cell damage which causes disease. Comparing twins who did different amounts of exercise they found that on average the telomeres were longer in more active ones.

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