It’s dangerous. Slipping on a treadmill can really mess you up (a friend got a gnarly goose egg on legs once from messing around on a treadmill). A faster treadmill makes it harder to keep up (consistent 12 mph pace is pretty fast) increasing the chances of falling. If you’re trying to be as speedy as possible your best venue for training is on a track while the treadmill is good for low impact aerobic exercise.
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