Timing myself 100m sprint?

Bob Gregis

New member
I have this 1.2km track and its separated into 100m tracks, so i trained there and i timed myself with a ipod touch stop watch. I got 14.5secs :( btw the track is curved
the problem is last year, i ran 13.5, year before i got 14.3 and these times were all measured at my school athletics carnival with proper stopwatches, why is my time so bad?
 
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