There’s also zero point in doing something in which one person vastly outperforms the other. Relationships should be about equality, even on the gym floor. A couple of years ago Will and I were invited on a cycling trip. It was billed as a weekend of ‘fun’ and as long as we were both relatively fit (we were), everyone would be happy. For a start, it was in the French Alps (should have been a warning sign, really). There was a mountain-biking competition going on. We had to cycle on bikes that looked (and moved) like combine harvesters before careening down dirt tracks as narrow as a bra strap. I cried. Will tried to be strong. He’d been run over in Brixton, twice. Yet even his legs were shaking. But that night, as one of the group was taken to A&E to fix a bloodied forearm, we went and scoffed fondue and laughed the hardest we had in years. Adrenaline, you see, is a powerful aphrodisiac. (There’s also something incredibly intimate about failing spectacularly together.) So I would urge you to do something together that genuinely scares the bejesus out of you. Trapeze perhaps, or a Tough Mudder endurance race, in which, I’m informed, you both get electrocuted as you cross the finish line.