Australians spend less than half as much improving their mental development as they do on their bodies.

From gym memberships, to vitamins and beauty treatments, the average Australian spends $1142 every year on their physical wellbeing.

And yet to exercise their brain – through online courses, books and education – they spend just over $600.

"We know we have a deficit of cognitive activity in Australia, we are simply not active enough," said Dr Amit Lampit, an international expert in brain training at the University of Sydney Brain and Mind Centre.