"Murky affairs: Bog-snorkelling"
Held annually in Wales, the competition attracts athletes from around
the world, who must swim two 55m lengths through a trench of murky,
leech-filled water. American swimmer extraordinaire Michael Phelps,
should he fancy a dip, might struggle: entrants must not use
conventional strokes and can only propel themselves with flippered feet.
Impressive, then, that the world record, held by Briton Kirsty Johnson,
is just 83 seconds. Mr Phelps’s 100m butterfly record, set with the
benefit of using his arms, is a shade under 50 seconds...
This is close to the top of the list of "Sports I'm Not Interested In Trying".