HIIT RUNNING... plz help!

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  • froeschli
    froeschli Posts: 1,292 Member
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    I just started HIIT. Doing it by heart rate though. Full out sprint until I just can't go any further, then walk until my heart rate's back down to 65%. I did it by time once, but when I read a heart rate of 230 after the second sprint, I decided that wasn't such a good idea :tongue:

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