I've recently come across Charlie Wittmack's challenge, The World Triathlon, which consists in none less than swimming down the whole Thames and cross the English Channel (275 miles / 443km), cycle to China (9,000 miles / 14,500km), before running to the summit of mount Everest (950 miles / 1,500km).

As you can imagine, this is not going to be trivial, but it's interesting to note that the first issue faced by Charlie was to inadvertently drink a sip of the Thames water and consequently falling violently ill! Luckily Charlie is now fine again and should be swimming in London tomorrow.

Ultra ultra triathlon