I recently posted a silly photo of me on Twitter wearing a surgical mask and bubble wrap as protection against germs and knocks during the week before my marathon. I won’t actually be sporting that outfit (!) but I will be taking some extra care of myself. You spend weeks religiously following a training programme, pushing yourself, making sacrifices and it’s a real shame if it all goes wrong at the final hurdle. I always say the hardest part of running a marathon is getting to the start line healthy, uninjured and ready to run. Here’s my advice for what to do in those last few days.