In reply to Thickhead:
7 marathons in 7 days is impressive, certainly, although I would be more impressed by one marathon done in a really fast time. But the 7 continents thing is not. It means loads of money and loads of CO2 emissions that the planet can really do without, for what, sitting on planes? Not impressed by that.
So, Kipsang's recent Berlin effort, or Mo Farah's sub-2 hour time next year if he really does that, are vastly more impressive, as was Radcliffe's awesome WR time for women of a few years ago.