Schoolboy error

Back from the New Forest Half Marathon and a(nother) disappointing time: 2 hours 9 minutes 10 seconds. Ten minutes slower than last year and nearly fifteen minutes slower than my target.

What went wrong ? Well, a few things, but mainly I set off too fast, using up too much energy in the first half and not keeping enough in reserve for the way back, and in the end I had several spells of walking before I got to the finish.

Looking at my stats for the first 5 miles shows the problem:
mile 1: 9m17s, avg HR: 149 bpm
mile 2: 8m52s, avg HR: 162 bpm
mile 3: 8m44s, avg HR: 168 bpm
mile 4: 8m51s, avg HR: 169 bpm
mile 5: 9m11s, avg HR: 175 bpm

While the times don't look unreasonable, the heart rate gives it away. In a previous 11 mile training run around Greenwich I averaged 157 bpm, and a comfortable range for easy running for me is 160-165 bpm. That steady rise towards 175bpm was unsustainable given the conditions and terrain, and sure enough shortly after the 10k mark I was walking, and did so twice more before running the majority of the (downhill) last three miles to the finish.

Aside from going off too fast, I think was a bit dehydrated - it was a hotter day than last year, and while I drank at all of the early water stations it probably wasn't enough. And - I'm clearly not as fit as I was at the same time last year. While I might be running plenty of miles along the Thames at lunchtime, last year I was running more hilly routes midweek, and was doing long runs more consistently.

So a rather disappointing day from a time point of view - the slowest of my three half marathons in fact. But at least my average pace was quicker than 10 minute miles (9:51) and it was still an enjoyable day - very friendly and amiable runners, beautiful scenery, enthusiastic supporters and well organised and marshalled. And Sophie, Sally and Phil all successfully completed the race, Sally in a new PB.

Due to the rules of my challenge, I can't claim the full 13.1 miles towards my challenge total, but any continuous run more than 1 mile counts, so according to my Garmin that means 6.12 + 1.24 + 1.25 + 1.53 + 1.71 miles, a total of 11.85 miles, bringing my total for the year to 787 miles.

Next race stop: the Royal Parks. A flatter course, and hopefully more sensible pacing and a better time...