Cuba\'s Olympic 110m hurdles champion Dayron Robles said Thursday that he is now injury-free and will start his build-up to the London Games on Friday in Ecuador. Robles, the world record holder, hurt his back in a training accident in Spain in March which ruled him out of the indoor world championships in Istanbul where he would have defended his title. \"I am completely recovered from my injury and I am going to Guayaquil in Ecuador for two weeks starting from Friday where I will be working on my technique,\" the 25-year-old told AFP. \"After my accident in Europe, I went back to Cuba to follow a short course of treatment and then worked under my coach Santiago Antunez but without overdoing it,\" he added. Robles plans to race on May 1 in Martinique, then in Puerto Rico, on May 12, Havana on May 27, Eugene, Oregon, on June 2 and then New York on June 9 before he heads to Europe.