Our expert says:
Yes, 1125m is about 0.7 miles. Funny distance to have to run, but anyway. Running that in under 5 minutes is not that tough, if you're relatively fit. I think the best thing you can do is first figure out where you are at fitness and performance wise. I know you've done 4 minutes on the treadmill, but maybe you can find a grass track or even a football field that has known dimensions. For example, if you find a rugby field and you know that the touchlines are 90m long, and the endlines are 60 m long, then doing one full lap of the field would give you a total of 300m. That means that four laps of a rugby field is equal to about 1200m, which would be a nice test distance.
I reckon you should first try that and just see what you're up against. Let's say you go out and run this 1200m test in 4 minutes 40 seconds. Then you have no problem, you're already fit enough. If you run it in 5 minutes 30 seconds, then it's touch and go, and so then you start to train a little more specifically for it.
So do that first, then decide. If you need to do some more training, my advice is to do what is called interval training. Here, find a stretch of grass that measures about 200m (you can run around the rugby field again), and repeat runs of 200m, maybe 4 or 5 times, with a short rest in between. For example, once a week, I'd say run 6 x 200m aiming for about 45 seconds, with a rest of 1 minute in between. If you can do that session, then you'll be training just faster than you have to run this trial, and teaching your body how to do it. But only do that once a week, not more, or you might injure yourself.
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