I don't know which version Nancy saw, but there was a study in the BMJ that included a chair test of how long to do 10 "rises", balancing on one leg, and grip strength. http://www.telegraph.co.uk/news/hea...-longevity.html
http://www.bmj.com/content/348/bmj.g2219

And here is a 30 second chair test from the US CDC. http://www.cdc.gov/steadi/pdf/30_se...tand_test-a.pdf

That floor version would have been impossible for me at any age