The World Anti Doping Agency says it won't revoke its new measures to crack down on doping despite protests by many high profile sport stars who claim their privacy's being invaded.
The rules require all athletes to give notice of their whereabouts for one hour of every day for possible testing.
It's been criticised by the likes of tennis stars Rafael Nadal and Andy Murray and the Russian pole vaulter Yelena Isinbayeva.
But WADA's director David Howman says sportsmen and women should be more flexible, especially tennis players who travel regularly.
He says it takes only a moment to text their next destination to the agency.
