you got that right. from the wiki article...
Before the 1988 season, Griffith Joyner's best 100 meter time was 10.96 seconds. In 1988 she improved that by 0.47 seconds, a time that no one has approached since. Similarly, her pre-1988 best at 200 meters was 21.96. In 1988 she improved that by 0.62 seconds to 21.34...
btw, 1988 was not her first Olympics.
Also I remember seeing pre 1988 pictures of her, and the difference in the musculature of her thighs was dramatic.


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