Clocking up endless miles, week in, week out, will obviously keep you pretty fit. But if you really want to upgrade your running skills, you need to look beyond super-long slogs.

As Jonny Jacobs advises, “If you want to become a better runner, you need to increase your cardiovascular fitness, muscular endurance and running economy – and to do that, you need to incorporate interval training and strength training.”

Interval training involves short bursts of high-intensity activity followed by low-intensity recovery periods – in other words, you run as fast as you can, slow to a gentle jog while you catch your breath, then repeat. Fast slow fast slow, and so on.

Strength training, meanwhile, involves using weights or your own bodyweight to buff yourself up.