For example lets say you ran in flats on soft dirt (not hard packed, and a little lose so you can sink in at places). And lets say you ran at the same effort on the track, or on well cut grass. How many seconds would that be worth?
For example lets say you ran in flats on soft dirt (not hard packed, and a little lose so you can sink in at places). And lets say you ran at the same effort on the track, or on well cut grass. How many seconds would that be worth?