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Originally Posted by illpunches
yes, it's meant to push ur limits. warm up 2 minutes, then see what dead spring u can handle and do that for 2 minutes, walk 30 seconds, then sprint another 2 minutes. do this cycle for about 20 minutes.
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typically its the other way around, the work set is usually smaller than the active rest set. So sprint all out for 25-60 sec, then walk until you can go again or if you want to prescribe the rest period probably 1-3 minutes.
but there are many ways to do HIIT. whatever way you do it, you shouldn't be able to breathe after the work set.