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After the age of 40, lots of things change: your body loses muscles and stores fat more easily; connective tissue becomes weaker. But on the bright side, you can slow down your biological clock. Two top experts will tell you exactly what is about to change for you and, above all, how you can manage to stay fit, slim and attractive well beyond 40. Keep extra fit with three popular training styles: Nordic Walking, Power Walking, and Light Running – each with instructions about technique, equipment and training plans.