i do a lot of sprinting and i am the best in my part of england at my age.......And as the olympics are in london in 2012 you never know i may be in it lol...So my dad wrote a long letter to the athletics association of england and they said they are perfectly fine because these steriods are actually NEEDED to run the body of a cah sufferer...If i was taking them but didn’t have a reason for it then they may become a problem, but i’ve played sport at national level and they’re fine about it.