How long does it take to change a habit? It varies, but one paper suggests it takes an average of 66 days. We asked writers to change one thing in their lives within that timeframe … and tell us if it works

It was desperate times that forced me to turn to run clubs. As a naturally unathletic person, joining a run club is about as radical a move as I could make – but I had to do something.

In July, I had an episode of atrial fibrillation, a medical issue where your heart beats to the wrong rhythm for an extended period. I was in hospital for three days while my heart raced at more than double the normal heart rate, the odd glow of the monitor haunting me.