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Builder Simon Jacob talks to Gillian Russell about the physical and mental preparations for doing a triple ironman triathlon ... only 6 days after doing a single ironman. The triple ironman consists of a 7.2 mile swim, a 336 mile cycle and a 78.2 mile run. What possessed Simon to sign up for it, how does he fit his training in around work and family life ... and just how is he feeling about the daunting challenge with only a few days to go?

While most of us wouldn't ever consider a triple ironman, are you curious about what your body could perhaps achieve? What do you think your fitness limit is and would you push yourself to it - or beyond? Sports and exercise doctor Niall Elliot explains what is happening to our bodies when we push ourselves and what the potential dangers might be.

At one time completing a marathon was the ultimate fitness goal but now lots of people are striving for more. Sports psychologist Dr Ian Boardley examines at the psychology and motivation for taking part in extreme events and suggests what we might get out of it mentally.