and Griffith University in Australia. In fact, a 2009 study of over 10,000 subjects reported that between-meal nibblers were 69 per cent more likely to pack on pounds over five years.Frequent eating only works if you choose nutritious foods and are forever

and maintain a reasonable pace, you still only have about 2,000 calories worth of glycogen stored in your muscles – enough to get most runners to about mile 18 or 20," he says. "As glycogen reserves are used up and fatty acid metabolism increases, your heart

says.Dr Jaques advises women to keep their heart rate at or below 140 beats per minute (bpm) while exercising. Experiments on pregnant dogs suggest that running at an intensity greater than 70 per cent VO2max (the point of maximum oxygen capacity

. In fact, a 2009 study of over 10,000 subjects reported that between-meal nibblers were 69 per cent more likely to pack on pounds over five years.Frequent eating only works if you choose nutritious foods and are forever vigilant when it comes to controlling

crashed. He now believes he did too many hard 20-milers in the heat. "I was exhausted from the first step of the marathon," he says. He finished 15th in 2:14:19.HydrationEveryone knows drinking fluids is supposed to help you run faster. But you have