Runners have to work out there reaction time after working out how many metres they can travel a second to work out their total time. this can help them train better and reach a higher place in their career.
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The length of a sprint is usually 100m
by cheating
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100
Sally pearson does the 100m hurdles and the 100m sprint
9:58 by jamaicas Usain Bolt,10:49 in womens 100m sprint
long sprint short sprint 100m hurdles and so on
Athletics: 100m Sprint 200m Sprint Etc.
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by speed training. most common way is to sprint for 100m jog for next 100m sprint another 100m jog 100m. do this continously for 30mins. do it at least 3 times a week. your speed will improve. maybe not significantly but it will improve.