The marathon world-record holder says the data can be easily misunderstood and misinterpreted.
Paula Radcliffe's final marathon was one to remember.
The greatest women's marathoner of all-time will run one more in London.
Radcliffe has been fending off doping accusations in the wake of other PED revelations.
London will reportedly be Radcliffe's final marathon of her career.
Many women report making strength and speed gains after giving birth.
He is the man to beat in Moscow.
Mo Farah continues to lead the charge.
A list of the top 100 track & field athletes using the social media service Twitter.