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Something that might help acclimate you to the shorter intervals is to work your way up the speed ladder.
Start at 5 mph, then back to 3.5, then up to 5.5, then back to 3.5, and keep increasing it by .5 every time you go back up to a sprint. It'll take a few minutes to get up to the highest setting, but once you do, it'll be super-intense. Might not work for your running style, but I personally find it harder to slack off near the end if I start off at a lower intensity and then move it up.
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