I understand that anabolic steroids are totally banned in international sporting arena because they destroy the spirit of sports and also distort the level playing ground in any sporting activities. But, I am on the opinion that in order to get an upstart in international sports as a career, one has to move really quick. 

This gives me a doubt, every good sportsman would have taken anabolic steroids in their training time initially to remain in good shape and have endurance and stamina. However, they wopuld have stopped in right in time so that the doping agency don't detect it. What are your thoughts?