Penny Comins: Just what drives us?

 Given that she's just completed the Norseman and is heading off to Kona in a couple of weeks it might seem an odd question to be asking but Penny Comins has just watched the start of the North Face Ultra Trail du Mont Blanc and is wondering what drives the body to such extremes?  Website: Tri247   Feature link       

Given that she's just completed the Norseman and is heading off to Kona in a couple of weeks it might seem an odd question to be asking but Penny Comins has just watched the start of the North Face Ultra Trail du Mont Blanc and is wondering what drives the body to such extremes?

Website: Tri247

Feature link