World-firsts still up for grabs include swimming the Pacific, leaping 9 metres and holding your breath for 30 minutes Bad news for anyone who secretly fancies themselves every time they lace up their trainers: the two-hour marathon record has gone.

World-firsts still up for grabs include swimming the Pacific, leaping 9 metres and holding your breath for 30 minutes Bad news for anyone who secretly fancies themselves every time they lace up their trainers: the two-hour marathon record has gone.