A wise man once told me that progress is not lineal. And so it has proved in Super Fit Dad-land as the burgeoning juggernaut of PBs, progress and self-satisfied improvement has careened off the road and screeched to an abrupt halt. The wheels, it seems, have well and truly fallen off the wagon.

What has happened to precipitate such an almighty decline in performance? And has it really been that bad? Let’s look at the symptoms for clues.