Sometimes, it feels like science is on a mission to upset me.

Not only does it turn out that upper body workouts (which I hate) might be key to better running, but apparently, cardio should be done after weights if you want to build muscle, pivotal to healthy ageing.

Until about seven weeks ago, I was trying (and failing) to adopt the advice. I had previously been running before my strength training sessions every time I hit the gym – but the prospect of even a five-minute jog after Bulgarian split squats felt impossible.

To be honest, though, the issues began long before that attempted change. Even when I was cramming cardio first in my hour-long, pre-work gym sessions, I didn’t feel I was jogging for long enough to really improve my pace or endurance.

And my lifts struggled, despite my (beloved)........

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