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03-23-2007, 10:11 AM
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Join Date: Mar 2006
Location: Pittsburghish
Posts: 5,976
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I've been doing HIIT for a week now but I sprint for 40 seconds instead of 20.
It just kills your legs. I actually just did it this morning. Walking stairs is a workout in itself right now.
It's great though because it only takes about 20 mins so I have time to get a very good workout in between classes.

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