Half Marathon Time Prediction

That 10 miler essentially converts to a 1:20 half. Was it a race effort or did you have something left? My guess is that wiped you out, no? But I think either way 1:20 is in the ballpark. Are you tapering for the half? I assume not since you're running Boston. If you're running on tired legs, sub 1:20 might be tough.

Good HM workouts for you if you haven't already been doing them:

5 - 8 mi @ 6:20ish pace

Any longer interval eg 6 x 1 mi or 3 x 2 mi @ 6:10ish pace, with shorter recoveries

Do some strides on an easy day if you feel ok, also incorporate some hills if you can.

With three weeks left you should have done most of the work already, so too much you can do now to improve. In fact, I wouldn't do any of the above workouts the week of the race. Cut the mileage down on the intervals (like 2 x 2 mi or 4 x 1 mi).

It was just a training run and I definitely had gas left in the tank. I'm planning on running a 20 miler this Saturday, but keeping it pretty easy the week following up to the race.

I just did 10x800m tonight at 2:50 each with 2:50 rest. The last one I went 100% and managed to squeeze out a 2:30.

I definitely already do the faster short runs, but haven't done mile/2 mile repeats like that. Perhaps I'll do one of those this Thursday.

Thanks, comfortably hard!

If you're going to run cruise intervals, keep the rest honest.

6x1M (HMP) with 60s rest is a decent workout. 6x1M (HMP) with 120s rest is too easy.

I was in the same situation as you before my first half marathon last year. I found that the best workout I could do to get a true indication of half marathon fitness was a 4 x 2 mile workout at 180 BPM Heart Rate. This was my threshold pace, which I typically consider to be half marathon pace in my training. You should be able to hold your threshold for about 8-12 minutes, so maybe do something closer to 2800-3000 meters per repeat with a few minutes rest in between. Your heart rate may vary slightly from the 180 bpm range, but if you are between 175-185 bpm during the workout you should get a pretty good idea if you can run your 1:20 goal time. Hope this helps.

[quote]isaiahj wrote:

Hello! I'm a longtime reader, but first time poster of this great community. I'm running a half marathon in less than 3 weeks (April 4th)

That's less than 2 wks

Hope the 1/2 marathon does not have laps as you might lose count

Doclove wrote:

[quote]isaiahj wrote:

Hello! I'm a longtime reader, but first time poster of this great community. I'm running a half marathon in less than 3 weeks (April 4th)

That's less than 2 wks

Hope the 1/2 marathon does not have laps as you might lose count

Technically, April 4th is LESS than three weeks away. I don't think the OP intention was advice about his ability to count, but rather his ability to run a half marathon.

Dude, didn't you read the "how far can you run at HM pace" thread? 4 miles at HM is quite hard. If you're running 10 miles in 62 minutes in training than 1:20 is unrealistically slow. 1:17-1:18.

This is very encouraging. Thanks, guys!

After running 10x800m last night, I did another fast 10 miles in the snow. I managed to clock 1:02:45 and am feeling pretty confident about being able to whip out a 1:20 for my half marathon!

I'll be taking it easy for a few days, but need to do a long run this weekend. I was thinking about doing my last 20 mile run this Saturday (first half easy and then second half at race pace). Thoughts?

You should have ran 2:44 the whole time then, and really worked to not fall off the last one. That's a hard workout. Not saving energy for the last one.