I ran the Treeathlon 5km race today in a new personal best of 21m 27s. That's a full 75 seconds faster than my previous best. I put it down to the fast, flat course in Battersea Park (and figured had I not had the week I'd just had, I could have run even faster).
After the race, I looked at my Garmin GPS watch more closely to find that it had recorded the distance as 4.7km. I've also been trying out the new Nike+ iPhone GPS app and had set that off at the start, and it too recorded 4.7km. Two different devices, same distance recorded, makes it likely that they're right, and the race distance was wrong. I ran home the long way and the devices agreed again, on a distance that I know having run it dozens of times.
Sadly, then, there's no new PB. Had the course covered the full distance, I think I would have needed all of those extra 75 seconds, and probably a few more, to make it home.
The question, though, is why wasn't it a 5km course? Did they measure it incorrectly? Did all of the runners in front of me take a wrong turn and miss out 300 metres of course? Was this an effort at a feel-good conspiracy? Will this be a new trend ahead of the Olympics designed to make all Brit runners feel like they're getting faster?