Polar F4 heart monitor

Exercise is all well and good but wouldn't it be so much better if you knew exactly how well you were doing? The Polar F4 is styled like a digital wrist watch (it is one too); wear it whilst it tracks calorie expenditure and it also has a stop watch, heart touch, average/max heart rate and free webservice for data transfer. It's also water resistant up to 50m. Tesco's currently have a deal on where you'll save £10 bringing it in at £47.47

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