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My experience with HIIT has been jogging/running outdoors. It works fantastic until you injure yourself - and you injure yourself pretty quickly if you don't flat-out sprint that often.

Do they have a 'HIIT mode' on exercise equipment yet? Attempting to do the intervals on stationary bikes or treadmills while mashing the down button after a sprint is difficult.

I am not a fan of flat out sprinting on treadmills because it seems scary, but all the ones I've used definitely have an option to stop/slow down after a set period of time. Here's an example manual: http://www.bhnorthamerica.com/BHFH/reso/bhf/ownersmanual/Tre...

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