“Loading up on tonnes of carbs is not the way to go,” says Jonny Jacobs. “There’s nothing worse than trying to run on a full stomach. Just eat your normal amount beforehand, so that you feel satisfied, but not stuffed.”

And if you’re off out running for more than an hour, you’ll need to rely on more than merely carbs scoffed beforehand. “The body can store glycogen – the fuel you need to keep you going – for about 90 mins,” says Jonny. “After that, you should consume something like an energy gel to help replenish your glycogen stores.

“For long endurance events such as marathons, your nutrition can actually be more important than your training.”