Most indoor running tracks are 200M, some are also odd distances like 140 or 150M, but you will sometimes stumble upon indoor 400M tracks (They are pretty rare).
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How is skin used in running track (What the #@%$* do you mean)
track and field
a track
generally indoor times are slower because indoor tracks are smaller. this means that you must complete more circuits to get the same distance on an indoor track. so, there are more turns to run, which slows people down.
It is if your doing it for track and field.