Link is
http://www.telegraph.co.uk/health/he...rly-death.html

But I post mainly to say the rules of the game are important. Clinical
tests of "single leg stance" sometimes[1] (often? always?) require you
to stand with arms crossed over chest, raise one foot so it's near but
not the ankle the other, and count the time only until you use your arms
or move the raised foot or move the foot you are standing on. It's a
damn sight harder when you can wobble!

Oh, and I suspect the Elves would insist you don't try it at home!

[1] 'Er indoors has vestibular impairment so I've seen some of it
--
Robin
reply to address is (meant to be) valid