"I wont be one of those people."And with no mention of newly-crowned 100m champion Gatlin, Bolt signed off with a word on athletes who abuse drugs in sports and what the message to children should be. Thats a good legacy to leave.". It has been a surprising championships with lots of shocks. Ive shown that you can do it without doping so thats what I hope the young athletes will take from it."Continue trying in anything you do, its a good message to the kids," he said."No! Ive seen too many people return and come back to sport and shame themselves," he said with a wry smile."When asked what his legacy would be, Bolt spun a line that will be music to the ears of Coe and all at the IAAF, his potential new employers as both parties seek a mutually satisfying position to incorporate the Bolt brand for the advancement of track and field."It is just the championships, not to do with me personally. All I know is track."I always tried my best 100 percent all the time and put on a good show."I am looking forward to being free."Often compared to American boxing great Muhammad Ali by IAAF president Sebastian Coe for not only his sporting prowess but also the charisma and larger-than-life personality he brought off-track, Bolt made the same link in a final press conference Sunday.Bolt insisted that there would be no comeback.

I am always going to leave everything on the track."Ive proven myself year in, year out," said the Jamaican, world record holder in the 100 and 200m, winner of eight Olympic golds and 14 world medals since making his debut in Helsinki in 2005 when he finished eighth and last in the 200m final."The sport is now on the way back up Shower chairs and we have to do everything to keep it in a good light."I have always been strong on doping," he said.Bolt brought down the curtain on his glittering career in dramatic fashion when he pulled up with a hamstring cramp halfway through his anchor leg in the 4x100m relay."I remember after losing the 100m, someone said to me: Usain, dont worry, Muhammad Ali lost his last fight also so dont be stressed about it." Turning to his disappointing 100m outing, Bolt said: "The whole champs has seen bad luck for certain athletes. "Ive said it, athletes should get life bans if you go out of your way to cheat an athlete."If you do that, you can be the best you can be."Im sad to be walking away now.

"My whole life has been track and field since I was 10. "Work hard, stay strong and push on."Its been a rough couple of days," admitted the 30-year-old. Everything happens for a reason; I dont know why it happened but it has.London: Jamaican Usain Bolt said Sunday he was sad but also excited to bow out of athletics, adding that his disappointing world campaign in London would not change his career achievements."I dont think one championships is going to change what Ive done in this sport. Its exciting, Im happy.That meant his final competitive race finished without a medal, Bolt having sealed a bronze in the individual 100m behind American duo Justin Gatlin, who has served two doping bans, and Christian Coleman. I need fun and to relax a little bit.

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