that genetics might be one factor, yet there are several other possible reasons for cramping up. Cramping your style: Fatigue"All muscular contractions are controlled by electrical impulses in the brain, communicated via nerves," explains Dr Ingham. One theory

burning sensation in your chest or throat The diagnosis: Acid reflux – or heartburn – is the bubbling up of stomach acid into the esophagus. "Vigorous exercise can cause reflux even in people who don't normally have a problem with it," says Jeukendrup

decreases, so your heart has to pump less blood faster to keep you cool, making you heat up more and making your heart beat even faster."The hours of training you put in make your body better at transporting oxygen to your muslces, so you stay below your

. Also, don't run within two hours of eating a main meal or a large drink. Or at least consume small amounts of fluid frequently rather than gulping a large drink.Twisted AnklesTurning your ankle halfway through a run has to be right up there with a tax

that’s how you used to smell and it ain’t pleasant! Watch those who smoke and see if you can work out why people smoke. There's no reason behind it - light up, inhale, blow out. You stink and it also ruins your lungs and heart. I know I sound like a

an Olympic Marathon, "the words pain and suffering very rarely come up", says Rojas. "What comes up is 'I relaxed', 'I focused', 'I stayed calm'." But why seek that pain at all? "It's an amazing thing for people outside of running to get their heads