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I did sprint 8 on the treadmill, and I've done it outside. I had good luck with both, but I prefer outside. On a treadmill I'd usually crank it to 15 the entire 30 seconds. On pavement I probably started out at 17 then was at 10 be the end of the thirty second. I will say that you look like madman doing it on the treadmill.
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In this world of sin and sorrow there is always something to be thankful for; as for me, I rejoice that I am not a Republican.
- H. L. Mencken
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