5 minute pace is so fast you would appear to a layman that you were sprinting round. I would check the route to be doubly sure. My iphone gps was quite a lot out.
Hey, its not a criticism , I think its a brilliant time ... I was just a bit gutted when I bought a fitbit watch and the 5k run was about 0.8k difference between by iPhone measurement of 5k. Mind you, on saying that, I never got below 6:30 per km in any case!
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