A standard running track has 400 m in one lap.
The 800 m race is therefore 2 laps of the track.
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In swimming there are 16 laps of a 50m pool (a standard Olympic size pool)
In running there are 2 laps of a 400m track (the standard athletics track)
Assuming it's a 'regulation' track - each lap is 400m - therefore two laps is 800m.