Hello I am Mark McGwire a former professional baseball first baseman and I played 16 seasons in Major League Baseball (MLB) from 1986 to 2001 for the Oakland Athletics and the St. Louis Cardinals. I also won 2 World Series championships one with the 1989 Oakland A's as a player and the other with the 2011 St Louis Cardinals as a baseball coach and in 2010 I admitted to using steroids during my MLB playing career and I only used it for my health and not for performance although I wish I would have never taken them.