London: Physical exercise helps to keep your brain healthy by boosting oxygen which is turn increases the number of blood vessels.

And experts say that exercise is the single most important measure you can take to help keep your cognitive abilities as you age.

The reason exercise is so vital is that that the body’s circulatory system begins to shrink as we age – reducing the amount of oxygen and glucose available to brain cells.

But to achieve real results exercise needs to last for at least 30 minutes at each session and to elevate heart rate. Walking is recommended if you don’t want to visit the gym.