Sports are about challenging our physical limits. But the greatest limit of all remains undefeated: age. We're taught to believe that ageing thwarts effort and grace, talent and grit, outstanding teamwork and individual brilliance.

But a new breed of top professionals - the likes of Roger Federer, Jo Pavey and Tom Brady - are overturning long-held assumptions about the duration of primetime in a sporting career. It's not that aging causes a decline in fitness; rather, a decline in fitness causes aging.

Jeff Bercovici steps inside the lives of such ageless athletes, following them as they train, compete, and recover, to dispel conventional wisdom about longevity. Full of cutting-edge science, technology and practical tips, Play On empowers you to reverse the ageing process, and extend your peak years.