Home > Newsletters > Daily: Love or hate Earth Hour? > Daily Dose: Are you happy in your job? > Health-in-Motion Updated 14 April 2016 Exercise your brain As with friendship, neglect and complacency can truly “undo” your brain. Your actual nerves, or grey matter, are mostly determined by your genes at birth. But your white matter – the insulating “telephone wire” that helps transmit information – continues growing until you’re about 45 or 50. What separates people with minds as nimble as kittens from those who process thought like lumbering old Labradors, is the amount of exercise they give their brains. Reading a book every week is the brain’s equivalent of a brisk daily walk 0 More in Newsletters Want to improve your teenager’s eating habits? More: Daily Dose: Are you happy in your job?Health-in-Motion advertisement Other news Lifestyle Why is altitude sickness so dangerous? Medical Zika may be passed on through tears and sweat Medical 'The Pill' may raise depression risk Medical FDA approves 1st 'artificial pancreas' for type 1 diabetes News SURVEY: Are you happy in your job? Medical Statins aren't the only way to lower cholesterol From our sponsors How to still have a good life with diabetes Eye-Q: R50 off! Lose weight Otrivin Menthol relieves sinus congestion Live healthier Love coffee? Your heart may too » What to eat for white teeth Bad foods for teeth-whitening Do any of these drinks cause your teeth to hurt? Savour your coffee – with a bright smile Here's how to stop coffee from staining your teeth while enjoying all its health benefits. Get your groove back! » Get your move on! Morning run? 5 exercises to start your summer fitness regime 6 easy ways to make your workout fun again Some inspiration to make sure your workout routine don't become tedious.