Every dog owner has done it. You pick it up. You squint at it. You think, "Is that… normal?" And then you immediately wish you had never looked that closely in the first place. But here's the truth.

Some people swear by early mornings. Others find joy in journaling. For a few, workouts have become part of their routine. But for Dr Karan Rajan, an NHS surgeon, it is something else, a habit that is ...