clearly how we engage the white blood cells contain a key that allows you to turn back the clock of your physiological age by a number of years. it's found inside the cell nucleus in the chromosomes which contain the genetic information or d.n.a. . strand of d.n.a. has a cap at the end known as a telomeres these caps protect the chromosome from becoming damaged. every time our cells divide the telomeres are shortened until eventually they cease to do their job causing the cells to age cease functioning or die. regular exercise appears to slow down this process. and a force to do discovery carried out a preliminary study with so-called master athletes. these are people who have done insurance training all their lives dry. marathon runners olympic champions world champions they trained on average for thirty five years and we found that in this