Running On Empty

Introduced by John Doyle

How far would you push yourself for a cause you believe in?

Australian CEO Mina Guli, 48, is on a mission to draw attention to the global water crisis. In order to do that she attempted a physical feat so extreme, most people would consider it impossible — running 100 marathons in 100 days across the world.

Mina is driven by urgency: By 2030, it's estimated the demand for fresh water will outstrip supply by 40 per cent.

But when her body literally broke during marathon 62, Mina thought all was lost.

Unexpectedly, the campaign took on a life of its own.