scott wrote:
> http://upload.wikimedia.org/wikipedia/commons/a/ad/Exercise_zones.png
> 
> If I do a "harcore" cycle ride for an hour or so my average is usually 
> about 155, which seems inside the 152-171 zone identified by that chart 
> for my age.

I thought your heart rates were determined by your current level of 
fitness rather than just your age.

>> Last night, I drove to my dance class, and I drove home again. And on 
>> both journeys, the monitor went crazy just as I drove past a specific 
>> roundabout. I have no idea why, but that seems like one hell of a 
>> coincidence...
> 
> High voltage electric cables above or below the ground?  Or a train line?

In fact, I seem to remember it happened to be that same location the 
*first* time I noticed it go wrong in the car too. So that's three 
malfunctions, all on the same road. Certainly sounds like an 
interferrence problem, doesn't it?

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