To mark the 15th anniversary of the bestselling series, Younger Next Year for Women now includes two new chapters on the link between physical exercise and brain health. Their message is straightforward: A program of consistent exercise and eating right not only helps us physically but improves memory, cognition, mood, and more.

Which makes the promise of Younger Next Year for Women even more urgent than ever – the world's population is getting older, living longer than ever, and wanting to stay strong, fit, sexy, and smart. This bestselling book shows us how to turn back our biological clocks – how to put off 70% of the normal problems of ageing (weakness, sore joints, bad balance), eliminate 50% of serious illness and injury, and now, become 10% smarter.

The key is found in Harry’s Rules, the linchpin of the Younger Next Year Philosophy: Exercise six days a week. Don't eat crap. Connect and commit to others. There are seven rules altogether, based on cell physiology, evolutionary biology, anthropology, and experimental psychology. Dr. Lodge explains how and why they work – and Chris Crowley, who is living proof of their effectiveness, gives the just-as-essential motivation.

And in the two new chapters, prominent neurologist Allan Hamilton explains how the program directly affects our brains – all the way down to the cellular level – while Crowley, in his inimitable voice, gives the personal side of the story.