It’s less how much exercise you do – but how consistently you do it. The latest of a seemingly endless welter of research into fitness and age found the brain may stay sharper if you do the same amount each day. Participants in the ten week study – yet further evidence suggesting the  marketing of walking gear to silvers should pay dividends – were over 55, cognitively healthy and fre from significant health issues. It found that taking the same number of steps each day, rather than increasing the total, improved reaction time and flexibility of thinking.