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  1. most effective HIIT intervals?

    Right now I do 30/60 intervals, 12 in total. Do them on an elliptical, bike or sprints. Last month I did 30/90, next month i'll do 20/40. Keep mixing it up I usually crank the resistance up at the intense part and go all out, its likely i only really do about 25secs and HR is up at 95%. When im...
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