how long should you sprint for?

I would say vice versa. For your what your looking for you want fast, hard,m explosive sprints. Its almost impossible to actually sprint for a minute straight, you may be running your hardest but your body can't stay at full speed that long. I myself don't like to get too mixed up with the time part anyway, if you have access to a track, I like to sprint the straight aways and walk the curves for about 5-7 laps. Its tougher than it sounds.
 
Honestly i actually do track and best thing to do

is sprint 400m walk 100
sprint 300 walk 100
sprint 200 walk 100
sprint 100

then go back up its what i call a pyramid

crazy workout if you actually complete it
 
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