Robin

“Chris opens a Twix as he studies the photo. He has his annual medical in two months, and every Monday he convinces himself that this is finally the week he gets back into shape, finally shifts the stone or so that holds him back. The stone or so that gives him cramp. The stone or so that stops him from buying new clothes, just in case, and that stops him dating, because who would want this? The stone or so that stands between him and the world. Two stone if he's really honest.
Those Mondays are usually good. Chris doesn't take the elevator on Mondays. Chris brings food from home on Mondays. Chris does sit-ups in bed on Mondays.
But by Tuesday, or in a good week, Wednesday, the world creeps back in, the stairs seem too daunting, and Chris loses faith in the project. He's aware that the project is himself, and that drags him further down still. So out come the pastries and the crisps, the garage lunch, the quick drink after work, the takeaway on the way home from work, the chocolate on the way home from the takeaway. The eating, the numbing, the release, the shame, and then the repeat.
But there was always next Monday, and one of these Mondays there would be salvation. That stone would drop off, followed by the other stone that was lurking. He'd barely break sweat at the medical, he'd be the athlete he always secretly knew he was. Text a thumbs-up to the new girlfriend he'd have met online.
He finishes the Twix and looks around for his crisps.”
― Richard Osman, The Thursday Murder Club