Writing is a muscle

Writing is a muscle. Smaller than a hamstring and slightly bigger than a bicep, and it needs to be exercised to get stronger.  (…) Think of your laptop as a machine like the one at the gym where you open and close your inner thighs in front of everyone, exposing both your insecurities and your genitals. Because that is what writing is all about.

Colin Nissan: The Ultimate Guide to Writing Better Than You Normally Do, via… je ne sais plus.