The american version of Survivor maybe, Rob. The first British series had Sarah Odell and Richard Owen (who very nearly won) - both of whom are experienced adventure racers. I watched just because I knew both of them. Speaking to them afterwards they'd enjoyed the experience and not had any problems with the conditions, which kind of proves the point.
In adventure racing, it's inevitably the foot stages where big gaps are made, Baga - though sometimes you're made to push a bike on these bits too! In my experience it's also the bits in the dark where races are won and lost.
