Alex has a problem with running; he has become addicted to it. “I have to get out and run, whether my family like it or not,” he says. “It’s just who I am.” Running three times a week has become ten ...

In March this year I completed the final run of my Couch to 5K plan. While I’d previously run two half marathons a decade ago, my cardio workouts (let’s be honest, any type of workout) had dwindled in ...