You trained for 26.2 so you didn’t expect to have to run over 27 miles to get to the finish line. What’s the deal?
. “USA Track & Field says ‘the shortest possible route is a reasonably well-defined and unambiguous route that ensures all runners will run at least the stated race distance,’” he says.
In theory, you’d ideally want to follow that exact SPR as you run, but that’s hard to do if you’re zig-zagging around thousands of others and navigating dozens of turns. And the more you veer off of it, the more likely you are to run over your anticipated distance. “It’s almost impossible to run the exact, certified distance of any road race unless the course is a straight shot with no turns and no other runners to run around,” says McGillivray.
Surprise: The GPS in your running watch is not perfect. In fact, GPS-enabled watches are guilty of a “systematic overestimation of distance,” adetermined. That’s because GPS watches don’t continuously track movement; instead, they ping your location to a satellite at different intervals and then measure the distance between each ping. If the satellites are slightly off each time they try to pick up your location, those discrepancies can add up.
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