Very interesting Statistic. I wonder how many of us have this gene? I'm not sure I have lol.
From realbuzz.com/articles-inter... - the other stats are interesting too.
"The marathon attracts people of all shapes, sizes and abilities, and it is perhaps from this that has strung the belief that anyone can run one as long as they train properly. However, while it may be true that most people could complete a marathon, research suggests that 20 per cent of people genetically would be incapable of running a marathon in a good time, even if they dedicated plenty of time to training properly.
Researchers at the University of Loughborough found that the ability to run a marathon in a good time requires a specific combination of genes, which nearly one fifth of the population simply don't possess. According to the researchers, those without this combination of genes will struggle to improve their performance no matter how much they dedicate themselves to training.
The reasoning for this is because this one fifth of people have muscles which don't extract as much oxygen as runners with this right mix of genes, and intensive training can actually further reduce their bodyβs ability to carry oxygen to their muscles. The researchers suggest that these runners would be better served by building up their strength and muscle tissue in the gym."