Neuroscience How does exercise aid your brain? Physical activity is a key way you can maintain you brain’s health, and is linked to the growth of new neurons. Now, we may know why, finds Helen Thomson EXERCISE may stimulate the growth of new neurons by making other brain cells contract. The discovery, which was in mice, could help explain how exercise boosts brain health and protects against cognitive decline. Exercise boosts our mental health and guards against cognitive decline ANDREW CABALLERO-REYNOLDS/AFP VIA GETTY IMAGES Being physically active is one of the key lifestyle factors for maintaining our mental health and guarding against cognitive decline. …