There is no magic pill which improves memory or brain health. But we can kick start improvements ourselves. Regular exercise like taking a brisk walk in the park or physical activities like gardening can nourish our brain and recharge batteries, galvanising brain power. Medical studies reveal that the fitter you are, the healthier your brain becomes. And if you flex your legs with a friend, all the better; staying socially active also polishes your thinking machine. Exercising 3 times a week in people aged over 65 has been linked with a reduced risk of developing dementia.