In message , Bob Hobden
writes
Don't do 10 mins the first night, 20 the next, 30 the next and so on
for weeks until finished and then just suddenly stop. According to the
experts that sudden stop is what caused my arthritis of the spine. Be
warned.

Really!? That's certainly useful to know, though I'm not sure how much
choice I have: weeks meeting deadlines and never moving from the
computer, then three free days - whee! - we both do battle with the
garden - then back to computer for another month: seems we're doing
ourselves no favours ...
--
Klara, Gatwick basin