The New Yorker did an interesting article examining one such cheater http://www.newyorker.com/magazine/2012/08/06/marathon-man http://www.newyorker.com/magazine

The New Yorker did an interesting article examining one such cheater http://www.newyorker.com/magazine/2012/08/06/marathon-man http://www.newyorker.com/magazine/2012/08/06/marathon-man