Trees, Bees and Day-drinking: a guest post by Kris Calvin

Sitting typing isn’t what we evolved to do, no matter how rewarding it might be. At your desk and/or away from it, how do you counteract the physical toll a writing life takes on your body?

Catriona writes: I'm doubly delighted today. First, I get to dodge this question, to which my answer would be . . . unedifying. Second - and much more important, my friend Kris Calvin is here! 

Kris is my film-going buddy (the day we sit in the cinema watching Paddington 3 is the day we'll know this is over);...