Along with the 310xt, I picked up the footpod. What this allows me to do is get speed/distance readings even when I'm running inside, based on calibration to my stride.
(It is also useful outdoors, as it can track cadence, or be used as a surrogate any time you lose the satellites.)
Now, I don't believe that the readings will be perfectly correlated to outdoor speed, just as I didn't believe that the treadmill was exact, either. But I am surprised by the differences in the readings. If anything, I would have guessed that the treadmill was overestimating, saying it was running faster than it was. But based on today, it was underestimating, by a considerable margin. My warm-up E-pace run is at 7.5 mph (4:58/km). The Garmin measured this as 4:35-4:40/km. The adjusted T-pace for today was 9.1 mph (4:05/km). According to the 310xt, I was knocking out a kilometre every 3:49.
Either way, I got in a solid 30 minute effort, so the day is a success. I guess we'll find out during my next hard run outside (race or otherwise) which is a closer measure of reality.
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