According to Tashi, it can be difficult to pinpoint when your trainers need replacing, because “old trainers that are worn in often feel really comfortable”. She says that, as a result, it is a good idea to keep an eye on how they look: “does the heel look squished? Has the rubber worn away on the soles? When you put your shoes on, are they flat or do they still have some shape?”

Sports doctor Sarah Davies from Panacea Health says to also look out for whether “the sole has worn through to the under layer, the midsole buckles easily under pressure, the heel has become bendy, or your toes have worn through the upper”.

Running: how often you need to replace your trainers, according to the experts