I read somewhere that a famous writer once said: your chair should be as uncomfortable as possible. I guess the rationale is that even if you're mid-flow, you need to get up and do something else. Your posture will thank you eventually. :-)
London-based, Cuban writer. Author of “Cuban, Immigrant, and Londoner” https://uk.bookshop.org/a/6886/9781528994293 https://acubaninlondon.medium.com/membership