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Treadmill HIIT Routine

anachronicles
anachronicles Posts: 109 Member
edited March 4 in Fitness and Exercise
I just wanted to get some opinions here on sprinting drills.

Is it best to do longer intervals at a slightly lower speed (1 minute at 8.5 with 30 seconds rest) or short intervals at a high intensity (30 seconds at 9.5 with 30 seconds rest)?

Thanks!

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