The problem with a treadmill is that you can't sprint at a constant speed for 30 seconds. If you can keep up with the treadmill, it's too slow at the beginning. If it's fast enough at the beginning, you won't be able to keep up with it at the end.
Get a couple hundred yard long space to run. Sprint for 30 seconds, then slowly jog back for 90 seconds. It should be pretty close to even.
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