with your health. A cold now would be as devastating as a serious injury. Even a very mild cold would still affect your running for a number of weeks. From personal experience, the two most important things that you can control are sleep and hydration

.’ Exercising in cold, dry air can induce an asthma attack. When you’re breathing through your mouth, cold air hits your lungs. This sudden temperature change can cause the bronchial tubes to spasm, explains Dr Lewis Maharam, author of Running Doc’s Guide

’s too cold or wet outside, stairwells are great venues for exercise. Try to do a few flights a day, several times when possible, to build your leg strength.

 same. You have to eat a lot of smaller jelly sweets such as jelly beans to match a gel. In hot marathons sweets can get very sticky or in cold conditions harder to chew. Some people find out what gels suit them then rarely use these until marathon day