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The sportsband has a sensor that fits in the base of a Nike+ trainer or a pocket attached to your laces on other trainers.
The sensor is a pedometer and an accelerator. Using these measurements the sportband calculates your speed and distance. This relies on a constant pace and stride for accuracy which can be improved by doing measured runs and adjusting.
Where it struggles is in the real world we do not pace consistently. Hills, energy etc all affect your pace and stride leading to incorrect readings.
I would not measure a race with it but in training a few yards short or long doesn't matter to most people. And it is only 40 quid
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Start weight: 18 st 4. Current weight: 15 st 6. Avg pace 8.54 /mi. Fastest 10K 54:06 Current goal: To reach 15st
Run Through Life Ten Minutes at a Time
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