We know that exercising can make us feel happier, with all those endorphins pumping through our bodies, but can going for a run actually make you smarter?

Studies looking at activity and cognition have found that exercise can in fact help us learn better and sharpen our wits.

The brain, it seems, is at its best when we’re active.  

Simon Morton spoke to John Ratey, author and associate Clinical Professor of Psychiatry at Harvard Medical School, is one of the foremost authorities on the brain-fitness connection.