Eight short years ago, Marion Jones was the pride of the US -- raking in medals at the Sydney Olympics. Then things fell apart when it was revealed that Jones took performance-enhancing drugs. She was stripped of her medals and was sentenced to time in prison for lying to federal prosecutors. In her first interview since her release, Jones spoke to Oprah about what really happened.

According to Jones, her former coach, Trevor Graham, gave her pills he described as flax seed oil. Jones, who took numerous substances such as vitamins and creatine, didn't question what he was giving her. Jones said she was instructed to put the tablet under her tongue for a while and then swallow it. Later, during the investigation, prosecutors showed Jones a vial of a designer steroid nicknamed "the clear." Jones now admits that she recognized it immediately as the substance her coach had given her. "I made the decision I was going to lie and try to cover it up," explained Jones. "I knew that all of my performances would be questioned."

There's a lesson for all athletes here. From the average Joe to the high school quarterback to elite athletes -- we're all responsible for what we put into our bodies. Supplements such as whey protein and creatine are frequently used by athletes. But even legal supplements shouldn't be used without knowledge and caution. Proper nutrition, consistent exercise, and appropriate training are your best bets for keeping your body in peak condition.

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