Are they crazy??? As a 40-year-old, I know how I feel when my HR is in the 170's - I get it there doing HIIT. Maintaining (for me) over 90% max HR for 80 minutes would be suicidal, and I'm in pretty good shape! 70-80% of INTENSITY, for me, would be HR in the 150's, maybe 160. And even then, I don't think I'd want to attempt 80 straight minutes that high. Isn't that what they invented intervals for?
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Bytsi
Hamster training log
Be careful about reading health books - you may die of a misprint -- Mark Twain
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