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I don't think 30 second reps with 30 second rest would help your athlete get better at longer workouts. I'd start with very controlled tempo runs and progression runs, start short and get a little longer each one for about 3 workouts. Like 2 mile controlled tempo up to 4 mile tempo and 3 mile progression up to 4 mile progression. Should be plenty for an 800 meter runner to get a decent base.
I do similar but slower workouts like this when it's hot in the summer and I'm doing base training. 30 seconds fast, 30 seconds slow or 45 seconds fast, 45 seconds slow. A good day would consist of 15 reps. I start out probably at tempo effort and work my way down to somewhere between mile and 3k effort.
It feels like a great stimulus without killing myself in the heat and serves as good preparation for longer reps down the road.
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