How do people balace while moving backwards.

balancing on ice skating - i love to watch ice skating but i don't know the science behind it.
This is photo of a professional ice skater on role.
October 19, 2008 6:36am CST
i know to skate even though i am not a professional one. I don't know the science behind the balancing while moving backwards on ice skating. I think it is concerned with center of gravity and center of mass.Is it true? Do you watch ice skating. Tell me some unbelievable moments on iceskating which you have seen.
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